Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares $ / shares in Thousands	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022
Preferred Stock, No Par Value (in dollars per share)	$ 0	$ 0
Preferred Stock, Shares Authorized (in shares)	1,000,000		1,000,000
Preferred Stock, Shares Issued (in shares)	0		0
Common Stock, No Par Value (in dollars per share)	$ 0	$ 0
Common Stock, Shares Authorized (in shares)	50,000,000	50,000,000
Common Stock, Shares, Outstanding (in shares)	28,349,720		27,484,514