Note 8 - Income Taxes - Components of Deferred Income Taxes (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Depreciation	$ 4,488	$ 3,251
Inventory	6,991	6,950
Compensation accruals	60,905	50,436
Accruals and reserves	77,777	64,732
Charitable contribution carryover	3,972	4,068
Derivatives	57,276
Related party investments	481,652
Intangibles	2,020
NQSO compensation	1,019,139	766,648
NOL and credits	9,655,388	7,479,505
Total deferred tax assets	11,369,608	8,375,590
Deferred tax liabilities:
Original issue discount	(216,891)
Total deferred tax liabilities	(216,891)
Net deferred tax assets	11,152,717	8,375,590
Less: valuation allowance	(11,152,717)	(8,375,590)
Total