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Note 2 - Supplemental Balance Sheet Information - Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Goodwill	$ 780	$ 780
Customer Relationships [Member]
Gross carrying amount	906	906
Accumulated amortization	(780)	(690)
Computer Software, Intangible Asset [Member]
Gross carrying amount	234	234
Accumulated amortization	$ (234)	$ (234)

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