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Note 1 - Basis of Presentation (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Contract with Customer, Liability, Current	$ 57,353		$ 66,572
Accounts Receivable, Allowance for Credit Loss, Current	205,000		205,522
Capitalized Computer Software, Additions	187,914	$ 135,419
Asset Impairment Charges, Total	0	$ 0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Ending Balance	$ 548,199		$ 515,199

X

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Amount of allowance for credit loss on accounts receivable, classified as current.

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