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Note 7 - Debt (Details Textual) - USD ($)
12 Months Ended
Mar. 13, 2020
Nov. 16, 2016
Sep. 02, 2016
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Repayments of Long-term Debt, Principal       $ (0) $ (0) $ 85,913,459
Gain (Loss) on Extinguishment of Debt, Total       $ 0 $ 0 (4,981,461)
Loan Agreement [Member] | Term Loan [Member] | OCM Strategic Credit SIGTEC Holdings, LLC [Member]            
Repayments of Long-term Debt Including Interest $ 87,200,000          
Repayments of Long-term Debt, Principal 80,000,000.0          
Repayments of Long-term Debt, Repayment Fee 4,000,000.0          
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total 1,200,000          
Repayments of Long-term Debt, Prepayment Premium $ 1,900,000          
Gain (Loss) on Extinguishment of Debt, Total           $ (5,000,000.0)
Proceeds from Issuance of Debt   $ 80,000,000.0        
Debt Instrument, Term (Year)     4 years