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Note 13 - Leases (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2019
Jun. 30, 2019
Jan. 31, 2019
Dec. 31, 2018
Lessee, Operating Lease, Renewal Term 5 years 5 years      
Lessee, Operating Lease, Option to Terminate Term 1 year        
Lessee, Operating Lease, Option to Extend, Amount   $ 700      
Lessee, Operating Lease, Lease Not yet Commenced, Future Minimum Payments Due $ 0 $ 0      
Operating Lease, Right-of-Use Asset     $ 11,395 $ 3,900
Operating Lease, Liability, Total     $ 10,978 $ 3,900  
Minimum [Member]          
Operating Lease, Remaining Lease Term   1 year      
Maximum [Member]          
Operating Lease, Remaining Lease Term   19 years