Annual report pursuant to Section 13 and 15(d)

Note 16 - Related Parties (Details Textual)

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Note 16 - Related Parties (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Airplane Services [Member]      
Related Party Transaction, Amounts of Transaction $ 0.3 $ 1.2 $ 1.3
Marine Transportation and Logistic Services [Member]      
Related Party Transaction, Amounts of Transaction 0.1 0.1 0.1
Repayments of Related Party Debt $ 14.4 $ 22.8 21.0
CEO and Largest Shareholder [Member] | Senior Second Lien Note Issuance [Member]      
Debt Instrument, Face Amount     $ 8.0