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Note 8 - Leases (Details Textual) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating Lease, Right-of-Use Asset $ 1,214  
Accounting Standards Update 2016-02 [Member]      
Operating Lease, Right-of-Use Asset   $ 1,280  
Minimum [Member]      
Lessee, Operating Lease, Term of Contract 270 days    
Maximum [Member]      
Lessee, Operating Lease, Term of Contract 18 years 109 days    
Lessee, Operating Lease, Renewal Term 15 years