Note 10 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
NOLs	$ 9,122,325	$ 9,456,605
Inventory and other reserves	24,128	24,128
Stock based compensation expense	296,657	853,239
Lease liability	16,125	25,151
Accruals	7,597	1,892
Deferred tax assets, other	96	96
Total deferred tax assets	9,466,928	10,361,111
Depreciation and amortization	(784,611)	(908,380)
Right-of-use assets	(16,054)	(24,767)
Valuation allowance	(9,504,575)	(10,388,911)
Net deferred tax liabilities	$ (838,312)	$ (960,947)