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