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Note 12 - Leases (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2019
Jan. 31, 2019
Jan. 01, 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   $ 2,400      
Lessee, Operating Lease, Lease Not yet Commenced, Future Minimum Payments Due $ 100 100      
Operating Lease, Right-of-Use Asset 12,206 12,206 $ 4,600 $ 8,800
Operating Lease, Liability, Total $ 11,710 $ 11,710 $ 4,600 $ 8,300  
Minimum [Member]          
Operating Lease, Remaining Lease Term   1 year      
Maximum [Member]          
Operating Lease, Remaining Lease Term   19 years      
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract 1 year 1 year