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

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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