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Note 6 - Long-term Debt (Details Textual) - Avenue Ventures Note Payable [Member] - USD ($)
$ in Millions
 1 Months Ended
Feb. 28, 2022
Apr. 30, 2022
Mar. 31, 2022
Repayments of Notes Payable $ 5.0    
Debt Instrument, Debt Default, Default Rate     5.00%
Debt Instrument, Debt Default, Foreclosed Cash     $ 4.8
Debt Instrument, Debt Default, Amount Applied To Principal     $ 3.8
Subsequent Event [Member]      
Debt Instrument, Debt Default, Amount Foreclosed   $ 0.5