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Note 4 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2023 USD ($) shares	Mar. 31, 2022 USD ($) shares	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Nov. 01, 2017 USD ($)
Number of Reporting Units	1
Goodwill, Impairment Loss	$ 484	$ 0
Foreign Currency Transaction Gain, before Tax	100	200
Severance Costs		300	$ 400
Supplemental Unemployment Benefits, Severance Benefits	300
Depreciation	23	$ 466
Liability for Contingent Milestone Payment, Noncurrent	$ 15,000			$ 15,000
Number of Shares of Common Stock Potentially Issuable upon the Exercise of Stock Options and Warrants (in shares) \| shares	0.5	0.4
Deerfield Loan [Member] \| Exchange and Termination Agreement [Member] \| Deerfield Management, L.P. [Member]
Liability for Contingent Milestone Payment, Noncurrent					$ 15,000
Manufacturing and Laboratory Equipment [Member]
Depreciation		$ 400
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	10 years