Note 2 - Revenue; Accounts and Unbilled Receivables - Accounts and Unbilled Receivables (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts receivable	$ 2,312	$ 2,705
Unbilled receivables (Contract Assets)	1,214	2,303
Allowance for doubtful accounts	(10)	0
Total	$ 3,516	$ 5,008

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

No definition available.

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- Definition

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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- Definition

Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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- Definition

The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

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