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Note 7 - Notes Payable (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Feb. 28, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 27, 2018
Proceeds from Notes Payable, Total       $ 50,000  
Interest Expense, Total   $ 1,054 $ 625 3,275 1,458  
Term Notes [Member]            
Debt Instrument, Face Amount           $ 250,000
Senior Notes [Member]            
Debt Instrument, Term 5 years          
Proceeds from Notes Payable, Total $ 50,000          
Debt Instrument, Interest Rate, Stated Percentage 5.00%          
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year   2,084   2,084    
Long-term Debt, Maturities, Repayments of Principal in Year Two   12,500   12,500    
Long-term Debt, Maturities, Repayments of Principal in Year Five   2,083   2,083    
Interest Expense, Total   547 $ 625 1,753 $ 1,458  
Long-term Debt, Maturities, Repayments of Principal in Year Three   12,500   12,500    
Long-term Debt, Maturities, Repayments of Principal in Year Four   $ 12,500   $ 12,500