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Note D - Leases (Details Textual)
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Operating Lease, Right-of-Use Asset $ 15,078 $ 17,679  
Operating Lease, Liability, Total $ 18,703 19,740  
Lessee, Lease, Termination Period (Year) 1 year    
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total $ 1,034 $ 1,138  
Finance Lease, Right-of-Use Asset, Accumulated Depreciation $ 500    
Lessee, Operating Lease, Lease Not yet Commenced, Number 1    
Minimum [Member]      
Lessee, Lease Remaining Lease Term (Year) 1 year    
Maximum [Member]      
Lessee, Lease Remaining Lease Term (Year) 6 years    
Lessee, Lease, Renewal Term (Year) 5 years    
Accounting Standards Update 2016-02 [Member]      
Operating Lease, Right-of-Use Asset     $ 22,800
Operating Lease, Liability, Total     $ 23,900