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Supplemental Balance Sheet Disclosures - Unbilled Receivables (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Unbilled Receivables          
Unbilled receivables, net of progress payments $ 1,600,034   $ 1,600,034   $ 1,597,672
Other income 15,628 $ 12,457 4,174,953 $ 71,490  
Change in operating income resulting from revised estimates (541,189) 232,344 849,435 1,896,726  
Inventories          
Raw materials 3,296,928   3,296,928   2,966,891
Work-in-process 901,076   901,076   500,869
Finished goods 335,035   335,035   178,068
Total inventories, net 4,533,039   4,533,039   3,645,828
Prepaid expenses and other current assets          
Prepaid insurance 425,837   425,837   386,212
Income tax refund receivable 209,791   209,791   106,932
Other 366,994   366,994   354,063
Total 1,002,622   1,002,622   847,207
Delta          
Unbilled Receivables          
Unbilled receivables, net of progress payments 1,600,000   1,600,000   1,600,000
Allowance for doubtful accounts         $ 3,600,000
Collection of unbilled receivables     7,750,000    
Other income     4,100,000    
Selling, General and Administrative Expenses | Delta          
Unbilled Receivables          
Reversal of reserve for loss on unbilled receivables 3,600,000   3,600,000    
Contracts accounted for under percentage of completion          
Unbilled Receivables          
Change in operating income resulting from revised estimates $ (45,000) $ (120,000) $ 76,000 $ 232,000