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Note 9 - Fair Value (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Long-term Debt, Fair Value $ 23,512,618  
Long-term Debt, Total 22,763,275  
Fair Value Adjustment of Warrants (2,175,824) $ (0)
Investment Income, Amortization of Discount 5,633,703  
Fair Value, Inputs, Level 1 [Member]    
Assets Held-in-trust, Total $ 138,730,613