Note 7 - Capital and Other Components of Equity (Details Textual)			1 Months Ended	3 Months Ended			9 Months Ended
	Jun. 29, 2020 USD ($) shares	Feb. 14, 2019 USD ($)	Feb. 28, 2019 USD ($)	Jun. 30, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($)	Jun. 30, 2021 shares	Dec. 31, 2021 USD ($)	Jun. 30, 2022 $ / shares shares	Nov. 10, 2021 USD ($)
At-the-market Sales Agreement, Common Stock, Maximum Amount	$ 75,000,000	$ 30,000,000							$ 75,000,000
At-the-market Sales Agreement, Term (Year)		3 years
At-the-market Sales Agreement, Underwriter Fees, Percentage of Sales	3.00%
Write Off of Deferred Financing Costs of At-the-Market Program			$ 115,000
Warrants Issued in May 2018 [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares				1				1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in CAD per share) | $ / shares								$ 10.48
Warrants Issued December 27, 2017 [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares				1				1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in CAD per share) | $ / shares				$ 10.08
Broker Warrants Issued May 2018 [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares				1				1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in CAD per share) | $ / shares				$ 10.10
At-the-market Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares	0			206,010		0
Proceeds from Issuance of Common Stock, Net				$ 195,000
Commission Costs Related to Share Sale				$ 6,000
Sale of Stock, Average Price Per Share (in dollars per share) | $ / shares				$ 0.97
Cost related to prospectus supplement amount					$ 198,000		$ 198,000
Minimum [Member]
At-the-market Sales Agreement, Underwriter Fees, Percentage of Sales		3.00%
Maximum [Member]
At-the-market Sales Agreement, Underwriter Fees, Percentage of Sales		4.00%