Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($)	Sep. 30, 2019	Oct. 01, 2018	Sep. 30, 2018
Assets:
Unbilled receivables	$ 2,723,000		$ 1,214,000
Inventories, net of reserves	4,646,000		4,106,000
Liabilities:
Contract liabilities	163,000		253,000
Stockholders' equity:
Retained earnings	$ 511,000		841,000
Adjustment for Topic 606 [Member]
Assets:
Unbilled receivables			40,000
Inventories, net of reserves			(18,000)
Liabilities:
Contract liabilities			0
Stockholders' equity:
Retained earnings			$ 22,000
Adjusted balance at 1-Oct-18
Assets:
Unbilled receivables		$ 1,254,000
Inventories, net of reserves		4,088,000
Liabilities:
Contract liabilities		253,000
Stockholders' equity:
Retained earnings		$ 863,000