Note 1 - Basis of Presentation (Details Textual) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Contract with Customer, Liability, Current	$ 30,882		$ 66,572
Accounts Receivable, Allowance for Credit Loss, Current	261,500		205,522
Capitalized Computer Software, Additions	561,177	$ 492,294
Asset Impairment Charges, Total	0		0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Ending Balance	$ 608,149		$ 515,199