Note 13 - Fair Value Measurements - Reconciliation of Level 3 Activity (Details) - USD ($) $ in Thousands		12 Months Ended
Mar. 05, 2020	Dec. 31, 2020	Dec. 31, 2019
Reclassification of warrant liability to additional paid-in capital upon adoption of ASU 2017-11	$ 865
Warrant Liabilities [Member] \| Fair Value, Inputs, Level 3 [Member]
Balance		$ 0	$ (865)
Reclassification of warrant liability to additional paid-in capital upon adoption of ASU 2017-11			865
Reclassification of warrant liability		1,986
Unrealized gains, net		(139)
Balance		$ 1,847	$ 0

Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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