Credit Facilities (Narrative) (Details) - Revolving Credit Facility	12 Months Ended
	Sep. 30, 2019 USD ($) letter_of_credit	Dec. 06, 2019 USD ($) letter_of_credit
Line of Credit Facility [Line Items]
Liquidity requirement, minimum after specific uses	$ 25,000,000
Liquidity requirement, minimum	7,500,000.0
Excess availability requirement, minimum	1,000,000.0
Long-term line of credit	$ 5,500,000
Interest rate at period end (percentage)	3.80%
Subsequent Event
Line of Credit Facility [Line Items]
Long-term line of credit		$ 3,200,000
Tenth Amendment
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 15,000,000.00
Tenth Amendment | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.75%
LIBOR Rate Loan
Line of Credit Facility [Line Items]
Standby letters of credit, total amount outstanding	$ 500,000
Number of standby letters of credit outstanding | letter_of_credit	1
Remaining borrowing capacity	$ 0
LIBOR Rate Loan | Subsequent Event
Line of Credit Facility [Line Items]
Standby letters of credit, total amount outstanding		$ 500,000
Number of standby letters of credit outstanding | letter_of_credit		1
Remaining borrowing capacity		$ 1,300,000