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Note 8 - Revolving Line of Credit (Details Textual) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2019
Jun. 30, 2019
Dec. 31, 2018
Mar. 31, 2019
Feb. 27, 2019
Long-term Line of Credit, Total       $ 43.8  
Line of Credit Facility, Remaining Borrowing Capacity       $ 31.2  
London Interbank Offered Rate (LIBOR) [Member] | Forecast [Member]          
Debt Instrument, Basis Spread on Variable Rate   2.00%      
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%