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Note 3 - Property, Plant and Equipment (Details Textual) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jan. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Depreciation   $ 38.4 $ 34.7
Other Assets [Member]      
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment   $ 4.6  
Headquarters Building and Adjoining Property [Member]      
Proceeds from Sale of Property Held-for-sale $ 10.1    
Gain (Loss) on Disposition of Property Plant Equipment $ 6.6