Note 4 - Valuation Accounts - Summary of Valuation and Allowance Accounts (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Balance, Beginning of Year	$ 623,494
Balance, End of Year	755,494	$ 623,494
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Balance, Beginning of Year	319,000	205,522
Net Charged to Costs and Expenses	0	151,951
Transfers	0	0
Net Write-off	0	(38,473)
Balance, End of Year	319,000	319,000
SEC Schedule, 12-09, Reserve, Legal [Member]
Balance, Beginning of Year	623,494	515,199
Net Charged to Costs and Expenses	132,000	132,000
Transfers	0	0
Net Write-off	0	(23,705)
Balance, End of Year	$ 755,494	$ 623,494