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Note 8 - Fair Value Measurements - Reconciliation of Level 3 Activity (Details) - Warrant Liabilities [Member]
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
Balance $ 1,847
Unrealized gain on warrants (573)
Reclassification of warrant liability to additional paid-in capital upon Warrant Modification (1,274)
Balance $ 0