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Note 2 - Supplemental Balance Sheet Information - Contract and Other Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Contract and other receivables	$ 1,853	$ 922
Allowance for doubtful accounts	(7)	(7)
Receivables, Net, Current, Total	$ 1,846	$ 915

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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