Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)					1 Months Ended			2 Months Ended	3 Months Ended						6 Months Ended	9 Months Ended
	Jul. 15, 2022	Apr. 26, 2021	Sep. 23, 2020	Aug. 10, 2017	Mar. 31, 2022	Dec. 31, 2021	Nov. 30, 2021	May 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 22, 2022	Nov. 12, 2021
Net Income (Loss) Attributable to Parent, Total									$ (3,076,000)	$ (3,935,000)	$ 3,140,000	$ 369,000	$ (1,433,000)	$ (3,902,000)		$ (3,871,000)	$ (4,966,000)
Gain (Loss) on Extinguishment of Debt, Total									0			0				4,277,000	0
Operating Income (Loss), Total									(2,638,000)			(2,860,000)				(7,197,000)	(8,174,000)
Cash and Cash Equivalents, at Carrying Value, Total						$ 149,000			211,000						$ 211,000	211,000
Working Capital Deficit									4,300,000						4,300,000	4,300,000
Accounts Receivable, Allowance for Credit Loss, Current						$ 482,000			245,000						$ 245,000	245,000
Accounts Receivable, Credit Loss Expense (Reversal)									0			(18,000)				0	(15,000)
Accounts Receivable, Allowance for Credit Loss, Writeoff											$ 237,000
Inventory Write-down									52,000			0				52,000	0
Interest Costs Capitalized									0			0				0	0
Impairment of Long-Lived Assets to be Disposed of									$ 0			$ 0				$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options and Warrants, Outstanding, Number (in shares)									1,192,085			1,195,019			1,192,085	1,192,085	1,195,019
Share-based Compensation Arrangement by Share-based Payment Award, Options and Warrants, Outstanding, Aggregate Intrinsic Value									$ 0			$ 0			$ 0	$ 0	$ 0
Payments of Dividends, Total																$ 0
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Open Tax Year																2019 2020 2021
State and Local Jurisdiction [Member]
Open Tax Year																2018 2019 2020 2021
Service-based Restricted Stock [Member]
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements (in shares)									242,500			25,000				242,500	25,000
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)																5 years
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)																30 years
Warrant Issued in Connection with Amended 2017 Credit Agreement [Member]
Warrants and Rights Outstanding, Term (Year)			5 years
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)			1,000,000
Conversion from 2017 Credit Agreement Loan Concession to Common Stock [Member]
Debt Conversion, Forgiven Debt, Amount			$ 16,000,000.0
Debt Conversion, Converted Instrument, Shares Issued (in shares)			533,334
The 2017 Credit Agreement [Member] | East West Bank [Member]
Debt Instrument, Covenant, Percentage of Projected Gross Revenue Achieved						80.00%	80.00%	80.00%			80.00%			70.00%	70.00%
Debt Instrument, Fee Amount																			$ 70,000
The 2017 Credit Agreement [Member] | East West Bank [Member] | Revolving Credit Facility [Member]
Debt Instrument, Term (Year)		10 years		3 years
Line of Credit Facility, Maximum Borrowing Capacity			$ 1,000,000.0	$ 37,000,000.0
Debt Instrument, Covenant, Percentage of Projected Gross Revenue Achieved						80.00%	80.00%	80.00%			80.00%				70.00%
Debt Instrument, Fee Amount																			$ 70,000
Debt Instrument, Decrease, Forgiveness					$ 4,300,000
July 2022 Convertible Note [Member]
Proceeds from Convertible Debt	$ 1,200,000
Debt Instrument, Face Amount									$ 1,200,000						$ 1,200,000	$ 1,200,000
Debt Instrument, Convertible, Conversion Price (in dollars per share)	$ 1.69								$ 1.69						$ 1.69	$ 1.69
Cross River Revolver [Member] | Cross River [Member]
Debt Instrument, Face Amount																		$ 750,000
March 2022 Convertible Note [Member]
Debt Instrument, Face Amount									$ 1,200,000						$ 1,200,000	$ 1,200,000
March 2022 Convertible Note and July 2022 Convertible Note [Member]
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities (in shares)									1,532,239							850,289