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Note 11 - Financial Information About Geographic Areas - Consolidated Net Sales and Long-lived Asset Information by Geographic Area (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Revenues	$ 14,785,000	$ 14,251,000	$ 45,279,000	$ 44,023,000
Reportable Geographical Components [Member]
Long-lived assets	8,207,000		8,207,000		$ 8,520,000
UNITED STATES | Reportable Geographical Components [Member]
Revenues	14,683,000	14,124,000	44,800,000	43,551,000
Long-lived assets	7,006,000		7,006,000		7,325,000
Non-US [Member] | Reportable Geographical Components [Member]
Revenues	102,000	$ 127,000	479,000	$ 472,000
Long-lived assets	$ 1,201,000		$ 1,201,000		$ 1,195,000

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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