Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025
Accounts receivable, allowance for doubtful accounts	$ 0	$ 0
Preferred stock par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	500,000	500,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares issued (in shares)	6,176,778	6,178,213
Common stock, shares outstanding (in shares)	6,176,778	6,178,213
Treasury stock, shares (in shares)	3,328,128	3,326,693