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Note 5 - Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Long-term Debt, Fair Value $ 141,400 $ 146,400
Long-term Debt, Gross 135,100 143,700
Fair Value, Nonrecurring [Member]    
Assets, Fair Value Disclosure 0 0
Investments Held in Rabbi Trust [Member]    
Debt Securities, Available-for-sale, Total $ 1,000 $ 1,100