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Note 10 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for doubtful accounts $ 771 $ 6,345  
Inventory capitalization 19,071 11,540  
Depreciation and amortization (211,014) (228,610)  
Investment tax credits 475,000 475,000  
Research & development tax credits 1,278,690 1,134,168  
Compensation costs 1,000,073 730,909  
Vacation accrual 333,396 323,860  
Accrued loss on legal settlement 0  
Net operating loss carryforward (7,280)  
Capital loss carryforward 26,627 26,627  
Gross deferred tax asset 2,915,334 2,479,839  
Less valuation allowance (475,000) (475,000) $ (475,000)
Net deferred tax asset 2,440,334 2,004,839  
Deferred income taxes 428,355 398,009  
Net long-term deferred tax asset 2,011,979 1,606,830  
Net deferred tax asset $ 2,440,334 $ 2,004,839