Annual report pursuant to Section 13 and 15(d)

Note 1 - Nature of Operations and Accounting Policies - Deferred Gain Activity (Details)

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Note 1 - Nature of Operations and Accounting Policies - Deferred Gain Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sale-leaseback and Financed Equipment Sales [Member]      
Balance at beginning of year $ 23,553 $ 32,035 $ 40,234
Amortization of deferred gains (8,037) (8,118) (8,199)
Recognition of deferred gains included in losses on asset dispositions and impairments, net (4,490)
Other (364)
Balance at end of year 11,026 23,553 32,035
Vessel Sales to Fifty Percent or Less Owned Subsidiaries [Member]      
Balance at beginning of year 1,453 1,875 3,064
Amortization of deferred gains (25) (36)
Other (635) (422) (1,153)
Balance at end of year $ 793 $ 1,453 $ 1,875