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Note 1 - Significant Accounting Policies - Summary of Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Receivables	$ 6,513	$ 8,243
Billed Revenues [Member]
Receivables	128	2,816
Unbilled Revenues [Member]
Receivables	6,385	5,427
US Department of Health and Human Services [Member]
Receivables	6,381	5,402
US Department of Health and Human Services [Member] | Billed Revenues [Member]
Receivables	0	0
US Department of Health and Human Services [Member] | Unbilled Revenues [Member]
Receivables	6,381	5,402
Royalty Receivables from Partners [Member]
Receivables		2,841
Receivables	132
Royalty Receivables from Partners [Member] | Billed Revenues [Member]
Receivables		2,816
Receivables	128
Royalty Receivables from Partners [Member] | Unbilled Revenues [Member]
Receivables		$ 25
Receivables	$ 4

X

- Definition

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

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- Definition

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+ References

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