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Note 12 - Lease Commitments (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Facilities Leased 58    
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals $ 1,319    
Operating Leases, Rent Expense, Minimum Rentals 6,794 $ 6,695 $ 6,823
Operating Leases, Rent Expense, Sublease Rentals 397 406 435
Operating Leases, Rent Expense, Net, Total $ 6,397 $ 6,289 $ 6,388