Note 6 - Net Loss Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Mar. 31, 2023	Mar. 31, 2022
Net loss	$ (2,375)	$ (2,418)	$ (2,529)	$ (2,100)	$ (2,180)	$ (2,029)	$ (7,322)	$ (6,309)
Denominator for basic and diluted net loss per share — weighted average common stock outstanding (in shares)	1,616			1,587			1,614	1,584
Net loss per common share (in dollars per share)	$ (1.47)			$ (1.32)			$ (4.54)	$ (3.98)