Note 10 - Income Taxes - Summary of Deferred Tax Assets (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss carryforwards	$ 5,942,000	$ 8,277,000
Depreciation and amortization	999,000	827,000
Non-cash compensation	(326,000)	(225,000)
Other	101,000	49,000
Valuation Allowance	(5,212,000)	(7,534,000)
Deferred tax asset	$ 1,504,000	$ 1,394,000