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Discontinued Operations (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations          
Gain on sale of discontinued operations, net of tax   $ 4 $ 8,359 $ 4 $ 8,359
Discontinued Operations, Disposed of by Sale | Global Aviation Services, LLC          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations          
Ownership percentage 100.00%   100.00%   100.00%
Purchase price consideration $ 21,000   $ 21,000   $ 21,000
Consideration earn-out provision 4,000   4,000   $ 4,000
Proceeds from divestiture of businesses $ 20,500        
Recognition of pre-tax gain on sale of GAS     10,800    
Tax expense on disposal     2,400    
Gain on sale of discontinued operations, net of tax     $ 8,400