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Note 2 - Sale of a Subsidiary and Discontinued Operations - Held for Sale and Discontinued Operations (Details) (Parentheticals) - USD ($)
$ in Thousands
12 Months Ended
Aug. 21, 2023
Jan. 31, 2024
Jan. 31, 2023
Gain on sale of Klein   $ 2,343 $ 0
Klein Marine Services, Inc. [Member]      
Gain on sale of Klein $ 2,400 $ 2,343 $ (0)