Note 11 - Income Taxes - Summary of Deferred Tax Assets (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Net operating loss carryforwards	$ 8,277,000	$ 10,753,000
Depreciation and amortization	827,000	668,000
Non-cash compensation	(225,000)	(69,000)
Other	49,000	46,000
Valuation Allowance	(7,534,000)	(10,004,000)
Deferred tax asset	$ 1,394,000	$ 1,394,000