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Note 12 - Income Taxes - Unrecognized Tax Benefits Roll Forward (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Balance at beginning of year $ 5,591,587 $ 5,649,188 $ 5,738,964
Additions 11,000 0 0
Reductions 0 (57,601) (89,776)
Settlements 0 0 0
Lapses in applicable statutes of limitation 0 0 0
Balance at the end of the year $ 5,602,587 $ 5,591,587 $ 5,649,188