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Note 5 - Leases (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2019
Operating Lease, Expense $ 297 $ 951  
Minimum [Member]      
Lessee, Operating Lease, Renewal Term     1 year
Maximum [Member]      
Lessee, Operating Lease, Renewal Term     5 years