Note 5 - Valuation Accounts - Summary of Valuation and Allowance Accounts (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Balance, Beginning of Year	$ 515,199
Balance, End of Year	623,494	$ 515,199
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Balance, Beginning of Year	205,522	123,165
Net Charged to Costs and Expenses	151,951	96,000
Transfers	0	0
Net Write-off	(38,473)	(13,643)
Balance, End of Year	319,000	205,522
SEC Schedule, 12-09, Reserve, Legal [Member]
Balance, Beginning of Year	515,199	506,153
Net Charged to Costs and Expenses	132,000	132,000
Transfers	0	0
Net Write-off	(23,705)	(122,954)
Balance, End of Year	$ 623,494	$ 515,199