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Note 9 - Leases (Details Textual) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Operating Lease, Liability, Total $ 1,388 $ 1,600
Lessee, Operating Lease, Renewal Term 5 years  
Operating Lease, Right-of-Use Asset $ 1,389 $ 1,600
Minimum [Member]    
Lessee, Operating Lease, Term of Contract 1 year  
Maximum [Member]    
Lessee, Operating Lease, Term of Contract 5 years