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Note 15 - Financial Instruments - Estimated of Fair Values of Other Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Other receivables, carrying amount $ 3,796 $ 3,833
Other receivables, fair value 3,796 3,833
Long-term debt, carrying amount 250,909 201,199
Long-term debt, fair value $ 263,660 $ 216,788