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Note 1 - Description of Business and Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property and equipment, gross $ 719,260 $ 655,487
Accumulated depreciation (368,602) (329,394)
Total property and equipment, net 350,658 326,093
Land [Member]    
Property and equipment, gross 50,458 44,611
Building and Building Improvements [Member]    
Property and equipment, gross $ 156,924 139,078
Building and Building Improvements [Member] | Minimum [Member]    
Estimated Useful Lives (Year) 7 years  
Building and Building Improvements [Member] | Maximum [Member]    
Estimated Useful Lives (Year) 40 years  
Equipment [Member]    
Property and equipment, gross $ 511,878 $ 471,798
Equipment [Member] | Minimum [Member]    
Estimated Useful Lives (Year) 3 years  
Equipment [Member] | Maximum [Member]    
Estimated Useful Lives (Year) 20 years