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Equity Method Investments (Details Textual) - USD ($)
shares in Millions
3 Months Ended 6 Months Ended
Nov. 08, 2019
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2020
Schedule of Equity Method Investments              
Loss from equity method investments   $ 498,000   $ 34,000 $ 1,056,000 $ 355,000  
Equity method investments   $ 3,945,000     $ 3,945,000   $ 5,208,000
Insignia              
Schedule of Equity Method Investments              
Number of shares held (in shares)   3.5     3.5    
Ownership percentage   29.00%     29.00%    
Loss from equity method investments   $ 500,000     $ 800,000    
Investment realized gain (loss) on disposal   24,000.0     48,000.0    
Equity method investments   $ 500,000     $ 500,000    
Cadillac Castings, Inc              
Schedule of Equity Method Investments              
Ownership percentage 19.90% 18.98%     18.98%    
Loss from equity method investments   $ 30,400     $ 300,000    
Difference between carrying amount and underlying equity $ 300,000            
Investment realized gain (loss) on disposal     $ 12,500   24,900    
Equity method investments   $ 2,900,000     $ 2,900,000    
Payments to acquire equity method investment $ 2,800,000