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Note 7 - Carrying Amounts and Fair Values (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Money Market Funds [Member]    
Money market investments $ 17,908  
Money market investments 17,908  
Commercial Paper [Member]    
Money market investments 79,960  
Money market investments 79,965  
Notes [Member]    
Long-term Debt 450,000  
Long-term debt, including current portion 457,875  
Term Loan [Member]    
Long-term Debt 98,125  
Long-term debt, including current portion 98,125  
Money market investments 106,217 $ 119,199
Long-term Debt $ 534,663 $ 535,511