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Note 10 - Deferred Tax Assets and Liabilities (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Allowance for doubtful accounts $ 6,345 $ 16,826
Inventory capitalization 11,540 23,185
Depreciation and amortization 228,610  
Depreciation and amortization   (371,669)
Investment tax credits 475,000 475,000
Research & development tax credits 1,134,168 696,865
Compensation costs 730,909 375,080
Vacation accrual $ 323,860 242,099
Accrued loss on legal settlement 1,674,500
Net operating loss carryforward 954,580
Capital loss carryforward $ 26,627 26,627
Gross deferred tax asset 2,479,839 4,113,093
Less valuation allowance (475,000) (475,000)
Net deferred tax asset 2,004,839 3,636,093
Net current deferred tax asset 398,009 2,887,960
Deferred income taxes 1,606,830 750,133
Net deferred tax asset $ 2,004,839 $ 3,638,093