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Note H - Goodwill and Other Intangible Assets (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets, Amortization Expense, Year Two $ 1.5    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 1.5    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 1.5    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 1.5    
Amortization of Intangible Assets 1.5 $ 1.4 $ 1.2
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months $ 1.5