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Note 9 - Fair Value (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Long-term Debt, Fair Value $ 23,183,469   $ 23,183,469  
Long-term Debt, Total 22,470,934   22,470,934  
Fair Value Adjustment of Warrants (883,928) $ (0) (3,059,752) $ (0)
Fair Value, Inputs, Level 1 [Member]        
Assets Held-in-trust, Total $ 138,725,782   $ 138,725,782