Note 15 - Common Stock (Details Textual) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended
		Sep. 30, 2021	Aug. 31, 2021	Sep. 30, 2021	Aug. 26, 2021	Dec. 31, 2004
Treasury Stock, Shares, Acquired (in shares)		41,816	15,943	57,759
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)	[1]	$ 5.49	$ 6.06
Repurchase Plan [Member]
Stock Repurchase Program, Authorized Amount					$ 2	$ 25
Treasury Stock, Shares, Acquired (in shares)		41,816	15,943	57,759
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)				$ 5.67

[1] Excludes broker commission.