Note 3 - Credit Arrangements (Details Textual)						12 Months Ended
	Sep. 30, 2022 USD ($)	Mar. 30, 2022 USD ($)	Jul. 28, 2021 USD ($)	Jun. 14, 2021 USD ($)	Aug. 20, 2020 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Apr. 20, 2020 USD ($)	May 14, 2018 USD ($)	May 11, 2018 USD ($) $ / shares shares
Derivative Liability, Noncurrent	$ 0					$ 0	$ 53,000
Derivative, Gain (Loss) on Derivative, Net, Total						53,000	13,000
Long-term Debt, Gross	921,000					921,000
Foreign Currency Transaction Gain (Loss), Realized						(63,000)	16,000
Subsidiaries [Member]
Foreign Currency Transaction Gain (Loss), Realized						0	0
Partners For Growth VL.P. [Member] | Warrant to Purchase Common Stock [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares										66,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares										$ 2.57
Exchange Price of Warrant										$ 250,000
PFG V Debt [Member]
Long-term Debt, Gross	2,300,000					2,300,000
Warrant Debt [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances						156,000
Paycheck Protection Program CARES Act [Member]
Debt Instrument, Face Amount								$ 2,300,000
Debt Instrument, Decrease, Forgiveness				$ 2,314,815
Debt Instrument, Interest Forgiven				$ 26,382
Promissory Note [Member] | Mediasite K.K. and Mitsui Sumitomo Bank [Member]
Debt Instrument, Interest Rate, Stated Percentage					0.46%
Debt Instrument, Term (Year)					3 years
Debt Instrument, Face Amount					$ 379,000
Debt Instrument, Grace Period (Year)					3 years
Notes Payable, Total	$ 277,000					$ 277,000
Loan Agreement [Member] | Mediasite K.K. and Resona Bank [Member]
Debt Instrument, Interest Rate, Stated Percentage	1.475%					1.475%
Debt Instrument, Term (Year)	7 years
Debt Instrument, Face Amount	$ 415,000					$ 415,000
Notes Payable, Total	59,000					59,000
Debt Instrument, Periodic Payment, Total	5,000
Partners For Growth VL.P. [Member]
Derivative Liability, Noncurrent	0					0	53,000
Derivative, Gain (Loss) on Derivative, Net, Total						53,000	12,000
Partners For Growth VL.P. [Member] | PFG V Debt [Member]
Debt Instrument, Fee Amount	150,000					$ 150,000
Debt Instrument, Term (Year)						3 years
Accretion Expense						$ 31,000	27,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance	0					0	0
Amortization of Debt Discount (Premium)						$ 0	34,000
Partners For Growth VL.P. [Member] | Warrant Debt [Member]
Debt Instrument, Term (Year)						5 years
Warrant Debt, PFG V [Member] | PFG V Debt [Member]
Long-Term Debt, Total	229,000					$ 229,000	198,000
US Bank [Member] | Revolving Credit Facility [Member]
Debt Instrument, Interest Rate, Stated Percentage		1.45%
Line of Credit Facility, Maximum Borrowing Capacity		$ 3,000,000	$ 3,000,000
Line of Credit Facility, Percent of Qualified Accounts Receivable Included in Borrowing Base			80.00%
Line of Credit Facility, Percent of Qualified Inventory Included in Borrowing Base			50.00%
Line of Credit Facility, Available Over-advance Included in Borrowing Base			$ 500,000
Debt Instrument, Basis Spread on Variable Rate		0.00%
Debt Instrument, Covenant, Fixed Charge Coverage Ratio			1.20
Debt Instrument, Covenant, Senior Cash Flow Coverage Ratio			3.00
US Bank [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate			1.35%
Mitsui Sumitomo Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 410,000					$ 410,000
Term Loan [Member] | Partners For Growth VL.P. [Member] | Loan and Security Agreement 2018 [Member]
Long-Term Debt, Total									$ 2,500,000
Debt Instrument, Fee Amount										$ 150,000
Term Loan Tranche 1 [Member] | Partners For Growth VL.P. [Member] | Loan and Security Agreement 2018 [Member]
Long-Term Debt, Total									$ 2,000,000
Debt Instrument, Interest Rate, Stated Percentage									10.75%
Term Loan Tranche 2 [Member] | Partners For Growth VL.P. [Member] | Loan and Security Agreement 2018 [Member]
Long-Term Debt, Total									$ 500,000
Line of Credit [Member] | Mitsui Sumitomo Bank [Member]
Long-Term Line of Credit, Total							$ 0