Note 5 - Stockholders' Equity (Tables)

3 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

					Aggregate Fair		Weighted Average
	Number of Shares				Market Value at		Remaining
	Underlying Warrants		Weighted Average		Issuance (In		Contractual Term
	(In thousands)		Exercise Price		thousands)		(Years)
Outstanding June 30, 2022		2,393	$	2.40	$	3,747		3.60
Warrants issued		—		—		—		—
Warrants exercised		—		—		—		—
Warrants expired		—		—		—		—
Outstanding September 30, 2022		2,393	$	2.40	$	3,747		3.35

					Number of Shares Underlying Warrants (In thousands)
Issue Date	Classification	Exercise Price		Expiration Date	September 30, 2022		June 30, 2022
March 26, 2020	Equity	$	6.25	March 25, 2025		25		25
March 30, 2020	Equity	$	4.69	March 27, 2025		61		61
October 23, 2020	Equity	$	2.88	October 21, 2025		470		470
October 28, 2020	Equity	$	2.69	October 28, 2025		173		173
February 16, 2021	Equity	$	4.06	February 11, 2026		171		171
April 12, 2021	Equity	$	1.88	April 7, 2026		1,493		1,493
Total Outstanding						2,393		2,393