Michael Cole
Analyst · Steve Chercover from D.A. Davidson
Thanks, Matt, and I'll start by reviewing our income statement. Our sales for the quarter increased 18% due to an increase in unit sales, driven in large part by much more favorable weather in 2012 and an increase in demand. In addition, average lumber prices were comparable year-over-year and had little impact on our sales comparisons.
Sales to the -- by market, sales to the retail market increased 12% due to an increase in unit sales. Within this market, sales to our big-box customers increased 4%, while our sales to other retailers increased 25%. As you might recall, one of our objectives is to increase our share of business with independent retailers. And as you can see from the numbers, we're having some success.
Our sales to the manufactured housing market increased 34% due to an increase in unit sales, primarily due to industry production of HUD-Code homes, which increased almost 43% year-over-year. In addition, approximately 1/3 of our sales to this market are from modular homes, and the most recent data from modular housing sources indicates that those shipments are up 8% year-over-year. When you blend this industry data together and compare it to our sales increase, you can see that we maintained our market share.
Our sales to the residential construction market increased 9% due to an increase in unit sales as plants we closed since April of last year caused our unit sales to decline by 2%. By comparison, housing starts experienced a year-over-year increase of 26% through February.
Our decline in market share was anticipated and is due to our focus on profitability. This segment is still challenged with excess capacity, so we continue to be selective in the business that we take in order to improve our performance in this segment.
Finally, our sales to the industrial market increased 21% as we added almost 200 new customers this quarter, and demand from existing customers improved substantially.
Moving down the income statement, our first quarter gross profit, as a percentage of sales, increased by 100 basis points primarily due to higher sales volume, combined with the operating leverage we have in the business. Also good weather this year, compared with inclement weather last year, favorably impacted our production efficiencies and gross margins in 2012. These improvements more than offset the effect of continued pricing pressure in each of our markets.
Selling, general and administrative expenses decreased by $700,000 or 1.5%, in spite of a $2.8 million increase in incentive compensation tied to profitability. The increase in incentive compensation more than offset -- was more than offset by a decline in base compensation and related expenses tied to a decline in headcount, as well as smaller decreases in amortization and bad debt expense.
Overall, we're very proud of how our people managed these costs in a period of higher growth and believe it is something we can continue to do in the future. As a result of the sales margin and cost improvements we discussed, our earnings per share increased to $0.21 per share, which is our best first quarter since 2006.
Moving on to our cash flow statement. Our cash flow used in operations was $45 million this year compared to $109 million last year. Our operating cash flow in 2012 is comprised of net earnings of $4 million and $8 million in the non-cash expenses, offset by a $57 million increase in working capital since December. Working capital increased since year end due to the normal seasonality of our business.
However, our inventories have decreased year-over-year, and today, are much better positioned relative to demand. In 2012, demand has been strong, and our inventory turnover has increased substantially over '11 when demand was much, much weaker than we expected, which resulted in higher inventory levels than we wanted at the end of March '11.
Investing activities include capital expenditures of almost $8 million, which includes about $5 million of expansionary capital expenditures that will drive future sales.
And finally, our seasonal working capital requirements were funded through our cash reserves and $34 million in borrowings under our revolving credit facility, which has a total remaining availability of almost $200 million.
With respect to our balance sheet, our total debt is $86 million compared to $127 million a year ago. We currently anticipate strong cash flows for the balance of the year. In absence of acquisitions, expect our debt to decrease as we move beyond our seasonal working capital requirements of Q1 and Q2.
That's all I have on the financials. Matt?