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Note 1 - Property and Equipment (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Land [Member]    
Property, Plant, and Equipment, Gross $ 44,544,000 $ 36,529,000
Building and Building Improvements [Member] | Minimum [Member]    
Property, Plant, and Equipment, Useful Life 7 years  
Building and Building Improvements [Member] | Maximum [Member]    
Property, Plant, and Equipment, Useful Life 40 years  
Building and Building Improvements [Member]    
Property, Plant, and Equipment, Gross $ 121,250,000 85,626,000
Equipment [Member] | Minimum [Member]    
Property, Plant, and Equipment, Useful Life 3 years  
Equipment [Member] | Maximum [Member]    
Property, Plant, and Equipment, Useful Life 20 years  
Equipment [Member]    
Property, Plant, and Equipment, Gross $ 457,544,000 420,380,000
Property, Plant, and Equipment, Gross 623,338,000 542,535,000
Accumulated depreciation 300,508,000 308,060,000
Property and equipment, net $ 322,830,000 $ 234,475,000