Debt and Subsequent Event - Narrative (Details)		1 Months Ended		12 Months Ended
	Dec. 21, 2023 USD ($)	Sep. 30, 2022 USD ($) lender	Oct. 31, 2021 USD ($)	Sep. 30, 2023 USD ($) customer	Sep. 30, 2022 USD ($) lender	Sep. 30, 2021 USD ($) lender	Nov. 08, 2023 USD ($)	Aug. 09, 2023 USD ($)	Aug. 08, 2023 USD ($)	Sep. 30, 2020 USD ($)	Apr. 10, 2020 USD ($)
Line of Credit Facility [Line Items]
Number of customer invoices factored | customer				1
Debt instrument, number of lenders | lender		2			2	2
Debt instrument, unamortized discount premium				$ 86,000
Revolving line of credit, accumulated amortization of debt issuance costs		$ 46,000		$ 78,000	$ 46,000
Revolving credit agreement
Line of Credit Facility [Line Items]
Percentage of stock pledged on credit agreement				66.67%
Notes Payable to Banks
Line of Credit Facility [Line Items]
Debt face amount										$ 1,465,000
Weighted average interest rate, revolving credit facility				6.96%
Long-term loan repayment schedule period				72 months
Notes Payable to Banks | Minimum
Line of Credit Facility [Line Items]
Debt instrument, term				6 months
Notes Payable to Banks | Maximum
Line of Credit Facility [Line Items]
Debt instrument, term				12 months
Notes Payable to Banks | Euro Interbank Offered Rate (Euribor)
Line of Credit Facility [Line Items]
Basis spread				3.20%
Foreign subsidiary borrowings
Line of Credit Facility [Line Items]
Receivables pledged as collateral		792,000		$ 1,247,000	792,000
Long-term debt		7,101,000		$ 5,771,000	7,101,000
Foreign subsidiary borrowings | Euro Interbank Offered Rate (Euribor) | Minimum
Line of Credit Facility [Line Items]
Euribor variable interest rates				0.50%
Foreign subsidiary borrowings | Euro Interbank Offered Rate (Euribor) | Maximum
Line of Credit Facility [Line Items]
Euribor variable interest rates				7.90%
Credit Agreement | Revolving credit agreement
Line of Credit Facility [Line Items]
Receivables pledged as collateral		22,711,000		$ 21,089,000	$ 22,711,000
Percent availability under revolving commitment					10.00%
Credit Agreement | Revolving credit agreement | Revolving credit agreement
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity		35,000,000		30,000,000	$ 35,000,000			$ 23,000,000	$ 28,000,000
Reserves under borrowing base									$ 1,500,000
Fixed charge coverage ratio									1.1
Debt instrument, covenant combined commitment percentage									10.00%
Debt instrument, covenant combined borrowing base, percentage									10.00%
Debt instrument, covenant combined borrowing base, amount									$ 2,000,000
Remaining borrowing capacity		9,403,000		2,830,000	9,403,000
Letters of credit		$ 1,970,000		$ 1,970,000	$ 1,970,000
Weighted average interest rate, revolving credit facility		4.86%		7.68%	4.86%
Commitment fee percentage				0.25%	0.25%
Credit Agreement | Revolving credit agreement | Revolving credit agreement | Subsequent event
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity	$ 19,000,000
Reserves under borrowing base							$ 1,500,000
Credit Agreement | Revolving credit agreement | Revolving credit agreement | Secured Overnight Financing Rate (SOFR)
Line of Credit Facility [Line Items]
Basis spread				2.25%	2.25%
Export Credit Facility | Revolving credit agreement | Revolving credit agreement
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity								7,000,000
Weighted average interest rate, revolving credit facility		4.36%		7.18%	4.36%
Export Credit Facility | Revolving credit agreement | Revolving credit agreement | Subsequent event
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity	7,000,000
Export Credit Facility | Revolving credit agreement | Revolving credit agreement | Secured Overnight Financing Rate (SOFR)
Line of Credit Facility [Line Items]
Basis spread				1.75%	1.75%
Credit Agreement And Export Credit Facility | Revolving credit agreement | Revolving credit agreement
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity								30,000,000	$ 35,000,000
Reserves under borrowing base				$ 1,500,000				1,500,000
Credit Agreement And Export Credit Facility | Revolving credit agreement | Revolving credit agreement | Subsequent event
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity	23,000,000
Reserves under borrowing base	1,500,000
Monthly increase in reserves under borrowing base	250,000
Credit Agreement And Export Credit Facility | Revolving credit agreement | Revolving credit agreement | Debt Covenant Period One
Line of Credit Facility [Line Items]
Debt covenant, maximum principal balance								18,000,000
Reserves under borrowing base								1,500,000
Credit Agreement And Export Credit Facility | Revolving credit agreement | Revolving credit agreement | Debt Covenant Period Two
Line of Credit Facility [Line Items]
Debt covenant, maximum principal balance								19,000,000
Reserves under borrowing base								$ 2,000,000
Subordinated Promissory Note | Subordinated note | Subsequent event | Director
Line of Credit Facility [Line Items]
Reserves under borrowing base	1,500,000
Debt face amount	3,000,000
Monthly increase in reserves under borrowing base	$ 250,000
Commitment fee percentage	0.50%
Borrowing base, percentage of eligible inventory	70.00%
Available funds paid to borrowers	$ 3,000,000
Interest rate, fixed percentage	14.00%
Fully earned and non-refundable fee	$ 150,000
Guaranty Fee	$ 760,000
Borrowing base calculation, percentage	85.00%
Subordinated Promissory Note | Subordinated note | Secured Overnight Financing Rate (SOFR) | Subsequent event | Director
Line of Credit Facility [Line Items]
Basis spread	2.75%
Subordinated Promissory Note | Subordinated note | CBFR | Subsequent event | Director
Line of Credit Facility [Line Items]
Basis spread	2.75%
Subordinated Promissory Note | Subordinated note | CB Floating Rate | Subsequent event | Director
Line of Credit Facility [Line Items]
Basis spread	0.25%
First Loan
Line of Credit Facility [Line Items]
Debt face amount			$ 1,200,000			$ 717,000
Debt instrument, term			6 years			7 years
Debt instrument, decrease, forgiveness						$ 287,000
Second Loan
Line of Credit Facility [Line Items]
Debt face amount		$ 1,100,000			$ 1,100,000	$ 303,000
Debt instrument, term		5 years				5 years
Paycheck Protection Program Loan | Unsecured Debt
Line of Credit Facility [Line Items]
Debt face amount											$ 5,025,000
Paycheck Protection Program Loan | Unsecured Debt | JPMORGAN CHASE BANK N.A.
Line of Credit Facility [Line Items]
Long-term debt		$ 0		$ 0	$ 0