Note 2 - Summary of Significant Accounting Policies and Recent Developments (Details Textual)			12 Months Ended
	Mar. 18, 2022 USD ($)	Mar. 18, 2021 USD ($)	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares	Mar. 24, 2022 USD ($)	Mar. 24, 2021 USD ($)
Net Income (Loss) Attributable to Parent, Total			$ (8,052,000)	$ (2,509,000)
Liabilities, Current, Total			12,532,000	4,574,000
Assets, Current, Total			5,593,000	4,880,000
Working Capital Deficit			6,900,000	306,000
Accounts Receivable, Allowance for Credit Loss, Current			482,000	322,000
Accounts Receivable, Credit Loss Expense (Reversal)			268,000	140,000
Inventory Write-down			0	18,000
Operating Income (Loss), Total			(11,413,000)	(12,737,000)
Impairment, Long-Lived Asset, Held-for-Use, Total			0	0
Impairment of Long-Lived Assets to be Disposed of			128,000	733,000
Goodwill and Intangible Asset Impairment, Total			$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options and Warrants, Outstanding, Number (in shares) | shares			1,374,640	1,079,629
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs			$ 815,000	$ 296,000
Employee Retention Tax Credit, Maximum Amount Per Employee Per Quarter			7,000
Employee Retention Tax Credit			1,800,000
Payments of Dividends, Total			$ 0
Certain Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate			0.00%
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Open Tax Year			2018 2019 2020 2021
State and Local Jurisdiction [Member]
Open Tax Year			2017 2018 2019 2020 2021
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)			5 years
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)			30 years
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Number of Major Customers			2	1
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer One [Member]
Concentration Risk, Percentage			31.00%	26.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Two [Member]
Concentration Risk, Percentage			14.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Number of Major Customers			1	1
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer One [Member]
Concentration Risk, Percentage			13.00%	14.00%
The 2022 Refinancing Agreement [Member] | East West Bank [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Fair Value of Amount Outstanding						$ 13,800,000
Repayments of Lines of Credit		$ 8,400,000
Lines of Credit, Percentage of Net Proceeds From Receivables Financing, Payments for Refinancing.		5.00%
Lines of Credit, Value of Net Proceeds From Receivables Financing, Payments for Refinancing.		$ 1,000,000.0
Long-Term Line of Credit, Noncurrent			$ 5,400,000
The 2022 Refinancing Agreement [Member] | East West Bank [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility, Fair Value of Amount Outstanding					$ 13,800,000
Repayments of Lines of Credit	$ 8,400,000
Lines of Credit, Percentage of Net Proceeds From Receivables Financing, Payments for Refinancing.	500.00%
Lines of Credit, Value of Net Proceeds From Receivables Financing, Payments for Refinancing.	$ 1,000,000.0