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Note 10 - Borrowings - Leverage Ratio (Details)
6 Months Ended
Jun. 30, 2020
Leverage Ratio1 [Member]  
Commitment Fee 0.15%
Leverage Ratio1 [Member] | London Interbank Offered Rate (LIBOR) [Member]  
Spread on variable rate 1.00%
Leverage Ratio1 [Member] | Base Rate [Member]  
Spread on variable rate 0.00%
Leverage Ratio 2 [Member]  
Commitment Fee 0.15%
Leverage Ratio 2 [Member] | London Interbank Offered Rate (LIBOR) [Member]  
Spread on variable rate 1.25%
Leverage Ratio 2 [Member] | Base Rate [Member]  
Spread on variable rate 0.25%
Leverage Ratio 3 [Member]  
Commitment Fee 0.20%
Leverage Ratio 3 [Member] | London Interbank Offered Rate (LIBOR) [Member]  
Spread on variable rate 1.50%
Leverage Ratio 3 [Member] | Base Rate [Member]  
Spread on variable rate 0.50%
Leverage Ratio 4 [Member]  
Commitment Fee 0.20%
Leverage Ratio 4 [Member] | London Interbank Offered Rate (LIBOR) [Member]  
Spread on variable rate 1.75%
Leverage Ratio 4 [Member] | Base Rate [Member]  
Spread on variable rate 0.75%
Leverage Ratio 5 [Member]  
Commitment Fee 0.25%
Leverage Ratio 5 [Member] | London Interbank Offered Rate (LIBOR) [Member]  
Spread on variable rate 2.00%
Leverage Ratio 5 [Member] | Base Rate [Member]  
Spread on variable rate 1.00%