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Note 5 - Derivative Financial Instruments (Details Textual) - Senior Notes, Second Issuance [Member]
$ in Millions
Sep. 30, 2019
USD ($)
Fair Value Hedging [Member] | Interest Rate Swap [Member] | London Interbank Offered Rate (LIBOR) [Member]  
Derivative, Variable Interest Rate 3.52%
Senior Notes [Member]  
Unsecured Debt, Total $ 350
Debt Instrument, Interest Rate, Stated Percentage 3.30%