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Note 4 - Trade Receivables - Summary of Receivables (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Total receivables	$ 1,932	$ 1,980
Billed Revenues [Member]
Total receivables	332	310
Unbilled Revenues [Member]
Total receivables	1,600	1,670
US Department of Health and Human Services [Member]
Total receivables	1,605	1,675
US Department of Health and Human Services [Member] | Billed Revenues [Member]
Total receivables	5	5
US Department of Health and Human Services [Member] | Unbilled Revenues [Member]
Total receivables	1,600	1,670
Royalty Receivables from Partners [Member]
Receivables	327	305
Royalty Receivables from Partners [Member] | Billed Revenues [Member]
Receivables	$ 327	305
Royalty Receivables from Partners [Member] | Unbilled Revenues [Member]
Receivables		$ 0

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.

+ References

No definition available.

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(5))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-06(3))
-URI https://asc.fasb.org/extlink&oid=120401414&loc=d3e604059-122996

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766

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