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Note 8 - Leases - Operating Lease Balance Sheet Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Total lease cost $ 63,139 $ 55,219  
Operating lease right-of-use assets 131,223   $ 197,355
Operating lease liabilities, current portion 96,584   159,665
Operating lease liabilities, non-current portion 33,366   37,829
Total operating lease liabilities $ 129,950   $ 197,494
Weighted average remaining lease term (in years) – operating leases (Year) 7 months 28 days   11 months 15 days
Weighted average discount rate – operating leases 5.50%   5.50%
Cash paid for amounts included in the measurement of operating lease liabilities $ 69,821   $ 65,108
2023 (9 months remaining) 95,911    
Lessee, Operating Lease, Liability, to be Paid, Year One 38,808    
Total future lease payments 134,719    
Less: imputed interest (4,769)    
Total $ 129,950   $ 197,494