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Note 14 - Liquidity (Details Textual) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Working Capital (Deficit) $ 180,200 $ 93,100
Letters of Credit Outstanding, Amount 36,700 $ 35,200
Line of Credit Facility, Remaining Borrowing Capacity 58,300  
Long-term Line of Credit, Total $ 0