Note 5 - Income Taxes (Details) - Components of Deferred Tax Assets and Deferred Tax Liabilities (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Components of Deferred Tax Assets and Deferred Tax Liabilities [Abstract]
Stock-based compensation	$ 2,553	$ 2,209
Inventory reserve	844	567
Allowance for doubtful accounts	250	333
Accrued expenses	440	720
Net state operating loss carryforwards of acquired company	1,288	1,037
Capital leases	5,483	5,396
	10,858	10,262
Valuation allowance	(1,017)	(1,037)
Total deferred tax assets	9,841	9,225
Goodwill	8,127	6,356
Depreciation and amortization	6,995	7,874
Total deferred tax liabilities	15,122	14,230
Net deferred tax liability	$ 5,281	$ 5,005