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Note 11 - Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Obsolete inventory | $ 21,881 | $ 21,881
Deferred tax assets, accrued vacation | 33,755 | 31,051
Accrued bonuses | 99,666 |
Stock-based compensation | 968,170 | 620,789
Basis difference in fixed assets | 33,241 | 33,241
Intangible assets, net | 572,687 | 634,521
Contribution, carryforward | 707 | 677
Net operating loss carryforwards | 2,588,401 | 747,589
Capital loss carryforward | 1,027,111 | 1,027,111
Valuation allowance | (5,312,769) | (3,089,306)
Deferred tax asset | 32,850 | 27,554
Other | (32,850) | (27,554)
Net deferred tax asset | $ 0 | $ 0

X
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