Note 10 - Shareholders' Equity - Shares Reserved (Details)	Jun. 30, 2023 shares
Common shares reserved for future issuance (in shares)	5,623,211
Stock Options Outstanding [Member]
Common shares reserved for future issuance (in shares)	3,643,513
Deferred Share Units [Member]
Common shares reserved for future issuance (in shares)	213,905
Restricted Stock Units (RSUs) [Member]
Common shares reserved for future issuance (in shares)	8,578
Common Share Purchase Warrants [Member]
Common shares reserved for future issuance (in shares)	205,000
The 2019 Omnibus Incentive Plan [Member]
Common shares reserved for future issuance (in shares)	1,157,215
The 2021 Employment Inducement Incentive Plan [Member]
Common shares reserved for future issuance (in shares)	395,000