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Note 1 - Basis of Presentation - Property and Equipment (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Land [Member]    
Property and equipment:    
Property and equipment $ 34,749 $ 32,085
Building and Building Improvements [Member] | Minimum [Member]    
Property and equipment:    
Property, Plant and Equipment, Useful Life 7 years  
Building and Building Improvements [Member] | Maximum [Member]    
Property and equipment:    
Property, Plant and Equipment, Useful Life 40 years  
Building and Building Improvements [Member]    
Property and equipment:    
Property and equipment $ 82,406 77,477
Equipment [Member] | Minimum [Member]    
Property and equipment:    
Property, Plant and Equipment, Useful Life 3 years  
Equipment [Member] | Maximum [Member]    
Property and equipment:    
Property, Plant and Equipment, Useful Life 20 years  
Equipment [Member]    
Property and equipment:    
Property and equipment $ 416,024 394,569
Property and equipment $ 533,179 504,131
Property, Plant and Equipment, Useful Life  
Accumulated depreciation $ (303,795) (282,320)
Total property and equipment, net $ 229,384 $ 221,811