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Note 10 - Fair Value of Assets and Liabilities - Fair Value Measurements, Not Recorded (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Revolver $ 223,004 $ 302,530
Carrying Value [Member]    
Revolver 223,004 302,530
Total liabilities not recorded at fair value 223,004 302,530
Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member]    
Revolver
Total liabilities not recorded at fair value
Carrying Value [Member] | Fair Value, Inputs, Level 2 [Member]    
Revolver 223,004 302,530
Total liabilities not recorded at fair value 223,004 302,530
Carrying Value [Member] | Fair Value, Inputs, Level 3 [Member]    
Revolver
Total liabilities not recorded at fair value