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Note 19 - Financial Instruments - Estimated of Fair Values of Other Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Reported Value Measurement [Member]    
Other receivables, fair value $ 4,170 $ 4,033
Long-term debt, fair value 589,604 766,623
Estimate of Fair Value Measurement [Member]    
Other receivables, fair value 4,170 4,033
Long-term debt, fair value $ 604,091 $ 779,279