Note 9 - Income Taxes - Summary of Deferred Tax Assets (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Net operating loss carryforwards	$ 5,024,000	$ 5,942,000
Depreciation and amortization	1,159,000	999,000
Non-cash compensation	(117,000)	(326,000)
Other	69,000	101,000
Total	6,135,000	6,716,000
Valuation Allowance	(4,631,000)	(5,212,000)
Deferred tax asset	$ 1,504,000	$ 1,504,000