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Quarterly Financial Data (Unaudited) - Summarized unaudited quarterly financial data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 49,994 us-gaap_SalesRevenueGoodsNet | $ 49,284 us-gaap_SalesRevenueGoodsNet | $ 57,576 us-gaap_SalesRevenueGoodsNet | $ 72,541 us-gaap_SalesRevenueGoodsNet | $ 48,632 us-gaap_SalesRevenueGoodsNet | $ 50,086 us-gaap_SalesRevenueGoodsNet | $ 60,479 us-gaap_SalesRevenueGoodsNet | $ 74,194 us-gaap_SalesRevenueGoodsNet | $ 229,395 us-gaap_SalesRevenueGoodsNet | $ 233,391 us-gaap_SalesRevenueGoodsNet | $ 227,829 us-gaap_SalesRevenueGoodsNet
Gross profit | 16,939 us-gaap_GrossProfit | 17,100 us-gaap_GrossProfit | 18,459 us-gaap_GrossProfit | 23,772 us-gaap_GrossProfit | 17,463 us-gaap_GrossProfit | 16,889 us-gaap_GrossProfit | 19,252 us-gaap_GrossProfit | 24,013 us-gaap_GrossProfit | 76,270 us-gaap_GrossProfit | 77,617 us-gaap_GrossProfit | 77,121 us-gaap_GrossProfit
Income from operations | 7,819 us-gaap_OperatingIncomeLoss | 7,666 us-gaap_OperatingIncomeLoss | 4,290 us-gaap_OperatingIncomeLoss | 7,838 us-gaap_OperatingIncomeLoss | 7,142 us-gaap_OperatingIncomeLoss | 7,047 us-gaap_OperatingIncomeLoss | 6,532 us-gaap_OperatingIncomeLoss | 7,497 us-gaap_OperatingIncomeLoss | 27,613 us-gaap_OperatingIncomeLoss | 28,218 us-gaap_OperatingIncomeLoss | 27,005 us-gaap_OperatingIncomeLoss
Net income | $ 4,951 us-gaap_NetIncomeLoss | $ 4,797 us-gaap_NetIncomeLoss | $ 2,732 us-gaap_NetIncomeLoss | $ 4,973 us-gaap_NetIncomeLoss | $ 4,526 us-gaap_NetIncomeLoss | $ 4,541 us-gaap_NetIncomeLoss | $ 4,150 us-gaap_NetIncomeLoss | $ 4,755 us-gaap_NetIncomeLoss | $ 17,453 us-gaap_NetIncomeLoss | $ 17,972 us-gaap_NetIncomeLoss | $ 17,165 us-gaap_NetIncomeLoss
Diluted net income per common share (in dollars per share) | $ 0.25 us-gaap_EarningsPerShareDiluted | $ 0.24 us-gaap_EarningsPerShareDiluted | $ 0.14 us-gaap_EarningsPerShareDiluted | $ 0.25 us-gaap_EarningsPerShareDiluted | $ 0.23 us-gaap_EarningsPerShareDiluted | $ 0.23 us-gaap_EarningsPerShareDiluted | $ 0.21 us-gaap_EarningsPerShareDiluted | $ 0.24 us-gaap_EarningsPerShareDiluted | $ 0.87 us-gaap_EarningsPerShareDiluted | $ 0.90 us-gaap_EarningsPerShareDiluted | $ 0.86 us-gaap_EarningsPerShareDiluted

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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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