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Note 7 - Notes Payable (Details Textual) - USD ($)
3 Months Ended
Apr. 17, 2020
Feb. 28, 2018
Mar. 31, 2021
Mar. 31, 2020
Long-Term Debt, Maturity, Year One     $ 9,423  
Paycheck Protection Program CARES Act [Member]        
Proceeds from Notes Payable, Total $ 170,200      
Interest Expense, Debt, Total $ 1,623   420 $ 0
Senior Notes [Member]        
Proceeds from Notes Payable, Total   $ 50,000    
Debt Instrument, Interest Rate, Stated Percentage   5.00%    
Long-Term Debt, Maturity, Year One     13,126  
Long-Term Debt, Maturity, Year Two     2,252  
Interest Expense, Debt, Total     $ 336 $ 485