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Note 10 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Allowance for doubtful accounts	$ 773	$ 771
Inventory capitalization	6,813	19,071
Depreciation and amortization	70,272
Depreciation and amortization		(211,014)
Investment tax credits		475,000
Research & development tax credits	496,930	1,278,690
Compensation costs	838,643	1,000,073
Vacation accrual	179,309	333,396
Net operating loss carryforward		(7,280)
Capital loss carryforward	16,446	26,627
Net long-term deferred tax asset	1,609,186	2,915,334
Less valuation allowance		(475,000)
Deferred income taxes	$ 1,609,186	$ 2,440,334

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