Note 4 - Credit Arrangements (Details Textual)					3 Months Ended		6 Months Ended
	Mar. 30, 2022 USD ($)	Jul. 28, 2021 USD ($)	Jun. 14, 2021 USD ($)	Aug. 20, 2020 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Apr. 20, 2020 USD ($)	May 14, 2018 USD ($)	May 11, 2018 USD ($) $ / shares shares
Derivative Liability, Noncurrent					$ 23,000		$ 23,000		$ 53,000
Derivative, Gain (Loss) on Derivative, Net, Total							30,000	$ (19,000)
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
Burish Notes, Net of Discount [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance					0		0		0
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
Partners For Growth VL.P. [Member]
Derivative Liability, Noncurrent					23,000		23,000		53,000
Derivative, Gain (Loss) on Derivative, Net, Total					2,000	$ (14,000)	$ 30,000	(19,000)
Partners For Growth VL.P. [Member] | PFG V Debt [Member]
Debt Instrument, Term (Year)							3 years
Amortization of Debt Discount (Premium)					0	14,000	$ 0	28,000
Interest Expense, Debt, Total					0	13,000	$ 0	25,000
Partners For Growth VL.P. [Member] | Warrant Debt [Member]
Debt Instrument, Term (Year)							5 years
Accretion Expense					8,000	7,000	$ 15,000	13,000
Partners For Growth VL.P. [Member] | Warrant Debt, PFG V [Member]
Long-term Debt, Total					213,000		213,000		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
Long-term Line of Credit, Total					0		0		0
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
Senior Notes [Member] | Partners For Growth VL.P. [Member] | PFG V Debt [Member]
Non-Cash Interest Expense, Debt					$ 0	$ 23,000	$ 0	$ 41,000
Line of Credit [Member] | Mitsui Sumitomo Bank [Member]
Long-term Line of Credit, Total									$ 0