Note 1 - Operations and Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jan. 01, 2023 USD ($)
Number of Operating Segments	1	2
Restricted Cash and Cash Equivalents, Current	$ 150,000	$ 150,000
Accounts Receivable, after Allowance for Credit Loss			$ 8,453,000
Accounts Receivable, Allowance for Credit Loss, Current	$ 15,000	121,000
Product Warranty Obligation, Term (Month)	27 months
Standard Product Warranty Accrual	$ 333,000	542,000
Inventory Valuation Reserves	758,000	627,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	0	0
Unrecognized Tax Benefits	0	0
Proceeds from Income Tax Refunds	0	146,000
Income Taxes Paid, Net	0	2,000
Interest Paid, Excluding Capitalized Interest, Operating Activities	278,000	$ 366,000
Impairment, Long-Lived Asset, Held-for-Use	$ 0
Domestic Tax Jurisdiction [Member]
Open Tax Year	2021 2022 2023 2024
State and Local Jurisdiction [Member]
Open Tax Year	2020 2021 2022 2023 2024
Minimum [Member]
Number Of Years Supply Certain Larger Quantities Of Other Product Support Items May Have To Be Purchased	1