Note 9 - Share-based Compensation - Summary of RSU Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares	6 Months Ended	12 Months Ended
Jun. 30, 2023	Dec. 31, 2022
Awards other than options, unvested, beginning balance (in shares)	922,057
Awards other than options, unvested, weighted average grant date fair value, beginning balance (in dollars per share)	$ 2.88
Weighted average vesting period (Year)	1 year 10 months 17 days	2 years 1 month 9 days
Awards other than options, Granted (in shares)	625,896
Awards other than options, granted, weighted average grant date fair value (in dollars per share)	$ 1.31
Awards other than options, Vested (in shares)	(734,444)
Awards other than options, vested, weighted average grant date fair value (in dollars per share)	$ 2.87
Awards other than options, Forfeited and cancelled (in shares)	(264,172)
Awards other than options, forfeited and cancelled, weighted average grant date fair value (in dollars per share)	$ 2.49
Awards other than options, unvested, beginning balance (in shares)	549,337	922,057
Awards other than options, unvested, weighted average grant date fair value, beginning balance (in dollars per share)	$ 2.03	$ 2.88

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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