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Note 7 - Notes Payable (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Apr. 17, 2020
Feb. 28, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Proceeds from Notes Payable, Total         $ 170,200
Paycheck Protection Program CARES Act [Member]            
Proceeds from Notes Payable, Total $ 170,200          
Debt Instrument, Periodic Payment, Total $ 9,578.16          
Interest Payable     $ 345   345  
Senior Notes [Member]            
Proceeds from Notes Payable, Total   $ 50,000        
Debt Instrument, Interest Rate, Stated Percentage   5.00%        
Long-Term Debt, Maturity, Remainder of Fiscal Year     6,013   6,013  
Long-Term Debt, Maturity, Year One     12,487   12,487  
Long-Term Debt, Maturity, Year Two     13,126   13,126  
Long-Term Debt, Maturity, Year Three     2,252   2,252  
Interest Expense, Debt, Total     $ 448 $ 586 $ 933 $ 1,207