Unbilled Receivables: (Details) - USD ($)	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Unbilled receivables
Unbilled receivables, net of progress payments	$ 3,920,209				$ 7,425,728				$ 3,920,209	$ 7,425,728
Change in operating income resulting from revised estimates	$ (2,884,231)	$ (264,862)	$ (637,965)	$ 166,315	(3,301,032)	$ 659,901	$ 1,089,640	$ 1,408,624	(3,620,743)	(142,868)	$ 1,927,465
Provision for loss on unbilled receivables									1,237,841	3,680,679
Contracts accounted for under percentage of completion
Unbilled receivables
Change in operating income resulting from revised estimates									117,000	(1,500,000)	$ (444,000)
Delta
Unbilled receivables
Unbilled receivables, net of progress payments					$ 3,700,000					3,700,000
Provision for loss on unbilled receivables									$ 1,300,000	$ 3,700,000