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Note 12 - Income Taxes (Detail) - Deferred tax assets and liabilities: (USD $) | Mar. 31, 2013 | Mar. 31, 2012
--- | --- | ---
Stock option compensation | $ 360,000 | $ 353,000
Inventory reserves | 296,000 | 290,000
Deferred tax assets | 1,002,000 | 1,069,000
Prepaid expenses | (232,000) | (286,000)
Property and equipment | (429,000) | (417,000)
Gross deferred tax liabilities | (661,000) | (703,000)
Net deferred tax asset | 341,000 | 366,000
Other | 16,000 | 21,000
Warranty reserve | 78,000 | 95,000
Accrued Vacation [Member] |  |
Deferred tax assets | 227,000 | 202,000
Accounts Receivable Reserve [Member] |  |
Deferred tax assets | $ 25,000 | $ 108,000

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