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Note 2 - Liquidity (Details Textual) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Working Capital (Deficit) $ 46.4 $ 40.9
Long-term Line of Credit 3.0  
Letters of Credit Outstanding, Amount 31.4 $ 34.3
Line of Credit Facility, Remaining Borrowing Capacity $ 60.6