Note 4 - Credit Arrangements (Details Textual)							3 Months Ended		6 Months Ended
	Mar. 24, 2023 USD ($)	Nov. 16, 2022 USD ($) $ / shares shares	Sep. 30, 2022 USD ($)	Mar. 30, 2022 USD ($)	Jul. 28, 2021 USD ($)	Aug. 20, 2020 USD ($)	Mar. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2022 USD ($)	Mar. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2022 USD ($)	Mar. 24, 2026	Dec. 31, 2022 USD ($)	May 14, 2018 USD ($)	May 11, 2018 USD ($) $ / shares shares
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares							$ 2.24		$ 2.24
Derivative, Gain (Loss) on Derivative, Net									$ (0)	$ 30,000
Long-term Debt, Gross							$ 9,407,000		9,407,000
Stock Issued During Period, Value, New Issues							3,000	$ 20,000	1,366,000	20,000
Board of Directors Chairman [Member] | Stock With Subscription Agreement [Member]
Stock Issued During Period, Value, New Issues		$ 1,200,000
Stock Issued During Period, Shares, New Issues (in shares) | shares		1,176,471
Related Party [Member]
Notes Payable, Current			$ 0				$ 2,833,000		$ 2,833,000
Warrant With Subscription Agreement [Member] | Board of Directors Chairman [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares		511,765					562,441		562,441
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 1.02
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
Loan and Security Agreement [Member]
Debt Instrument, Interest Rate, Stated Percentage		12.00%
Debt Instrument, Face Amount		$ 5,500,000
Debt Instrument, Number of Equal Installment		30
Debt Instrument, Fee, Percent		2.00%
Debt Instrument, Loan Premium, Percent of Loan Amount		20.00%
Debt Instrument, Covenant, Debt Coverage Ratio		1.15
Debt Instrument, Covenant, 6-month Billings Requirement, Tranche 1		$ 12,000,000
Debt Instrument, Covenant, 6-month Billings Requirement, Tranche 2		11,000,000
Debt Instrument, Covenant, 6-month Billings Requirement, Tranche 3		12,000,000
Debt Instrument, Covenant, 6-month EBITDA Burn Requirement, Tranche 1		6,000,000
Debt Instrument, Covenant, 6-month EBITDA Burn Requirement, Tranche 2		6,500,000
Debt Instrument, Covenant, 6-month EBITDA Burn Requirement, Tranche 3		7,000,000
Loan and Security Agreement [Member] | Related Party [Member]
Notes Payable, Current							1,800,000		1,800,000
Security Agreement and Promissory Note [Member] | Board of Directors Chairman [Member]
Debt Instrument, Face Amount		$ 3,000,000										$ 3,000,000
Security Agreement and Promissory Note [Member] | Related Party [Member] | Board of Directors Chairman [Member]
Notes Payable, Current							1,000,000.0		1,000,000.0
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
Japanese Finance Corporation Promissory Note [Member]
Debt Instrument, Interest Rate, Stated Percentage	0.50%
Debt Instrument, Term (Year)	7 years
Debt Instrument, Face Amount	$ 336,000
Notes Payable, Current							5,000		5,000
Japanese Finance Corporation Promissory Note [Member] | Forecast [Member]
Debt Instrument, Interest Rate, Stated Percentage											1.40%
Loan Agreement [Member] | Mediasite K.K. and Resona Bank [Member]
Debt Instrument, Interest Rate, Stated Percentage			1.475%
Debt Instrument, Term (Year)			7 years
Debt Instrument, Face Amount			$ 415,000
Notes Payable, Current							65,000		65,000
Debt Instrument, Periodic Payment, Total									5,000
Partners For Growth VL.P. [Member]
Derivative Liability, Noncurrent												$ 0
Derivative, Gain (Loss) on Derivative, Net							0	2,000	$ 0	30,000
Partners For Growth VL.P. [Member] | PFG V Debt [Member]
Debt Instrument, Term (Year)									3 years
Partners For Growth VL.P. [Member] | Warrant Debt [Member]
Debt Instrument, Term (Year)									5 years
Accretion Expense							9,000	$ 8,000	$ 17,000	$ 15,000
Warrant Debt, PFG V [Member] | PFG V Debt [Member]
Long-Term Debt, Total			229,000				$ 246,000		$ 246,000
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
US Bank [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) 1 [Member]
Debt Instrument, Basis Spread on Variable Rate					1.35%
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