Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Revenues	$ 17,830us-gaap_SalesRevenueNet	$ 13,116us-gaap_SalesRevenueNet	$ 52,770us-gaap_SalesRevenueNet	$ 37,010us-gaap_SalesRevenueNet
Cost of revenues	6,778us-gaap_CostOfRevenue	5,410us-gaap_CostOfRevenue	20,890us-gaap_CostOfRevenue	14,907us-gaap_CostOfRevenue
Gross profit	11,052us-gaap_GrossProfit	7,706us-gaap_GrossProfit	31,880us-gaap_GrossProfit	22,103us-gaap_GrossProfit
Operating expenses
Selling	1,772us-gaap_SellingExpense	1,595us-gaap_SellingExpense	5,177us-gaap_SellingExpense	4,097us-gaap_SellingExpense
General and administrative	4,740us-gaap_GeneralAndAdministrativeExpense	2,781us-gaap_GeneralAndAdministrativeExpense	12,581us-gaap_GeneralAndAdministrativeExpense	8,003us-gaap_GeneralAndAdministrativeExpense
Research and development	832us-gaap_ResearchAndDevelopmentExpense	524us-gaap_ResearchAndDevelopmentExpense	2,459us-gaap_ResearchAndDevelopmentExpense	1,639us-gaap_ResearchAndDevelopmentExpense
Total operating expenses	7,344us-gaap_OperatingExpenses	4,900us-gaap_OperatingExpenses	20,217us-gaap_OperatingExpenses	13,739us-gaap_OperatingExpenses
Operating income	3,708us-gaap_OperatingIncomeLoss	2,806us-gaap_OperatingIncomeLoss	11,663us-gaap_OperatingIncomeLoss	8,364us-gaap_OperatingIncomeLoss
Other income (expense), net	5us-gaap_OtherNonoperatingIncomeExpense	(79)us-gaap_OtherNonoperatingIncomeExpense	(314)us-gaap_OtherNonoperatingIncomeExpense	316us-gaap_OtherNonoperatingIncomeExpense
Earnings before income taxes	3,713	2,727	11,349	8,680
Income taxes	1,310us-gaap_IncomeTaxExpenseBenefit	981us-gaap_IncomeTaxExpenseBenefit	4,005us-gaap_IncomeTaxExpenseBenefit	3,142us-gaap_IncomeTaxExpenseBenefit
Net income	$ 2,403	$ 1,746	$ 7,344	$ 5,538
Net income per share:
Basic (in Dollars per share)	$ 0.68us-gaap_EarningsPerShareBasic	$ 0.51us-gaap_EarningsPerShareBasic	$ 2.09us-gaap_EarningsPerShareBasic	$ 1.62us-gaap_EarningsPerShareBasic
Diluted (in Dollars per share)	$ 0.66us-gaap_EarningsPerShareDiluted	$ 0.48us-gaap_EarningsPerShareDiluted	$ 2.01us-gaap_EarningsPerShareDiluted	$ 1.54us-gaap_EarningsPerShareDiluted
Weighted average common shares outstanding:
Basic (in Shares)	3,532	3,434	3,513	3,414
Diluted (in Shares)	3,654	3,637	3,649	3,591

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