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Note 12 - Fair Value of Financial Instruments - Summary of Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Reported Value Measurement [Member]    
Cash and Cash Equivalents $ 7,884 $ 21,199
Short-Term Debt (19,893) (6,000)
Long-Term Debt including Current Maturities (724,624) (689,764)
Estimate of Fair Value Measurement [Member]    
Cash and Cash Equivalents 7,884 21,199
Short-Term Debt (19,893) (6,000)
Long-Term Debt including Current Maturities $ (759,980) $ (742,279)