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Note 17 - Fair Value of Financial Instruments - Fair Value of Long-term Debt Other Than Lines of Credit (Details) - Equipment Financing [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Reported Value Measurement [Member]    
Long-term debt $ 172,636 $ 165,331
Estimate of Fair Value Measurement [Member]    
Long-term debt $ 171,289 $ 163,975