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Note 2 - Revenue Recognition (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 0  
Contract with Customer, Asset, Contract Assets Added 0 $ 131,943
Contract with Customer, Liability, Revenue Recognized 56,423 $ 492,494
Capitalized Contract Cost, Net, Total $ 0