Note 8 - Earnings Per Share (Details Textual) - shares	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Share-Based Payment Arrangement, Option [Member]
Statement [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	229,000	231,000	229,000	231,000