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Commitments and Contingencies (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2019
Jul. 18, 2016
Business Acquisition, Contingent Consideration [Line Items]        
Fair value of redeemable non-controlling interest $ 6,000,000   $ 6,000,000  
Change in redemption value     524,000  
Adjustment to fair value of redeemable non-controlling interest 781,000 $ (985,000) 203,858  
Contrail Aviation Support LLC. | Contrail Aviation Inc.        
Business Acquisition, Contingent Consideration [Line Items]        
Contingent consideration maximum per year       $ 1,500,000
Contingent consideration aggregate       $ 3,000,000
Current remaining liability $ 0   $ 0