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Note 10 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $) | Dec. 31, 2013 | Dec. 31, 2012
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Deferred Tax Assets and Liabilities [Abstract] |  |
Allowance for doubtful accounts | $ 45,148 | $ 13,618
Inventory capitalization | 36,591 | 15,792
Depreciation and amortization | (385,907) | (585,231)
Investment tax credits | 600,000 | 600,000
Research & development tax credits | 683,495 | 435,051
Compensation costs | 239,876 | 235,384
Vacation accrual | 274,307 | 250,046
Capital loss carryforward | 78,000 | 268,237
Gross deferred tax asset | 2,629,304 | 1,232,897
Less valuation allowance | (475,000) | (475,000)
Net deferred tax asset | 2,154,304 | 757,897
Net current deferred tax asset | 1,443,321 | 189,153
Net long-term deferred tax asset | $ 710,983 | $ 568,744

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