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Note 15 - Quarterly Results (Unaudited) (Details) - Quarterly Financial Information (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, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 18,560 us-gaap_SalesRevenueNet | $ 17,830 us-gaap_SalesRevenueNet | $ 18,540 us-gaap_SalesRevenueNet | $ 16,400 us-gaap_SalesRevenueNet | $ 15,714 us-gaap_SalesRevenueNet | $ 13,116 us-gaap_SalesRevenueNet | $ 12,676 us-gaap_SalesRevenueNet | $ 11,218 us-gaap_SalesRevenueNet | $ 12,808 us-gaap_SalesRevenueNet | $ 11,361 us-gaap_SalesRevenueNet | $ 11,706 us-gaap_SalesRevenueNet | $ 10,560 us-gaap_SalesRevenueNet | $ 71,330 us-gaap_SalesRevenueNet | $ 52,724 us-gaap_SalesRevenueNet | $ 46,435 us-gaap_SalesRevenueNet
Gross profit | 11,512 us-gaap_GrossProfit | 11,052 us-gaap_GrossProfit | 11,123 us-gaap_GrossProfit | 9,705 us-gaap_GrossProfit | 9,585 us-gaap_GrossProfit | 7,706 us-gaap_GrossProfit | 7,600 us-gaap_GrossProfit | 6,797 us-gaap_GrossProfit | 8,211 us-gaap_GrossProfit | 6,947 us-gaap_GrossProfit | 7,248 us-gaap_GrossProfit | 6,456 us-gaap_GrossProfit | 43,392 us-gaap_GrossProfit | 31,688 us-gaap_GrossProfit | 28,862 us-gaap_GrossProfit
Net income | $ 2,239 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 2,403 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 3,060 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 1,881 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 3,462 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 1,746 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 1,932 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 1,860 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 2,559 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 1,543 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 2,248 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 2,100 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 9,583 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 9,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 8,450 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net Income per share – basic (in Dollars per share) | $ 0.63 us-gaap_EarningsPerShareBasic | $ 0.68 us-gaap_EarningsPerShareBasic | $ 0.87 us-gaap_EarningsPerShareBasic | $ 0.54 us-gaap_EarningsPerShareBasic | $ 1.00 us-gaap_EarningsPerShareBasic | $ 0.51 us-gaap_EarningsPerShareBasic | $ 0.57 us-gaap_EarningsPerShareBasic | $ 0.55 us-gaap_EarningsPerShareBasic | $ 0.76 us-gaap_EarningsPerShareBasic | $ 0.46 us-gaap_EarningsPerShareBasic | $ 0.67 us-gaap_EarningsPerShareBasic | $ 0.63 us-gaap_EarningsPerShareBasic | $ 2.72 us-gaap_EarningsPerShareBasic | $ 2.61 us-gaap_EarningsPerShareBasic | $ 2.52 us-gaap_EarningsPerShareBasic
Net Income per share – diluted (in Dollars per share) | $ 0.61 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.66 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.84 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.51 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.95 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.48 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.54 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.52 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.71 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.44 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.64 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.59 us-gaap_EarningsPerShareBasicAndDiluted |  |  |

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- Definition The amount of net income (loss) for the period per each share of common stock or unit 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 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 9: 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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