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Note 2 - Supplemental Balance-sheet Information (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Amortization of Intangible Assets, Total	$ 91,000	$ 91,000
Depreciation, Depletion and Amortization, Nonproduction, Total	0.4	$ 0.4
Customer-Related Intangible Assets [Member]
Finite-Lived Intangible Asset, Expected Amortization, Year One	91,000
Finite-Lived Intangible Asset, Expected Amortization, Year Two	$ 34,000

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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