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Note 10 - Fair Value of Assets and Liabilities (Details Textual) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Revolving Credit Facility [Member]    
Long-term Debt, Fair Value $ 302.5 $ 196.2
Industrial Revenue Bonds [Member]    
Long-term Debt, Fair Value   $ 0.9