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Note 7 - Right of Use Assets - Balanace Sheet Information Related to Leases (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating lease right-of-use assets $ 31,664    
Operating lease accumulated amortization (2,908)    
Operating lease right-of-use asset, net 28,756 $ 30,100  
Operating lease current liabilities 5,738    
Operating lease liabilities 23,079    
Total operating lease liabilities 28,817 $ 30,100  
Property and equipment, at cost 410,995   $ 403,785
Accumulated depreciation (251,784)   $ (244,176)
Finance lease right-of-use asset, net 379    
Finance lease current liabilities 72    
Finance lease liabilities 325    
Total finance lease liabilities $ 397    
Operating leases (Year) 7 years    
Finance leases (Year) 6 years    
Operating leases 3.72%    
Finance leases 4.17%    
Assets Held Under Finance Leases [Member]      
Property and equipment, at cost $ 412    
Accumulated depreciation $ (33)