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Note 8 - Revolving Line of Credit (Details Textual) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Feb. 28, 2019
Mar. 31, 2020
Feb. 27, 2019
Long-term Line of Credit, Total   $ 7.9  
Line of Credit Facility, Remaining Borrowing Capacity   $ 67.1  
London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate   1.25%  
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]      
Debt Instrument, Basis Spread on Variable Rate 1.25%    
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]      
Debt Instrument, Basis Spread on Variable Rate 2.50%    
UNITED STATES      
Line of Credit Facility, Maximum Borrowing Capacity $ 75.0   $ 100.0
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.20%