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Note 8 - Revolving Line of Credit (Details Textual) - USD ($)
$ in Millions
1 Months Ended
Feb. 28, 2017
Mar. 31, 2018
Feb. 21, 2017
Long-term Line of Credit, Total   $ 45.3  
Line of Credit Facility, Remaining Borrowing Capacity   $ 54.7  
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     $ 100.0
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.15%