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Note 5 - Derivative Financial Instruments (Details Textual)
$ in Millions
Mar. 31, 2018
USD ($)
Senior Notes, First Issuance [Member] | Fair Value Hedging [Member] | Interest Rate Swap [Member] | London Interbank Offered Rate (LIBOR) [Member]  
Derivative, Variable Interest Rate 2.97%
Senior Notes, Third Issuance [Member] | Fair Value Hedging [Member] | Interest Rate Swap [Member] | London Interbank Offered Rate (LIBOR) [Member]  
Derivative, Variable Interest Rate 3.20%
Senior Notes [Member] | Senior Notes, First Issuance [Member]  
Unsecured Debt, Total $ 250.0
Debt Instrument, Interest Rate, Stated Percentage 2.40%
Senior Notes [Member] | Senior Notes, Third Issuance [Member]  
Unsecured Debt, Total $ 350.0
Debt Instrument, Interest Rate, Stated Percentage 3.30%