Note J - Treasury Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Sep. 18, 2020	Mar. 12, 2020
Stock Repurchase Program, Authorized Amount						$ 15,000
Treasury Stock, Value, Acquired, Cost Method	$ 639	$ 2,150	$ 4,140	$ 3,482
Stock Repurchase Plan [Member]
Stock Repurchase Program, Additional Amount Authorized					$ 2,000
Stock Repurchase Program, Authorized Amount					$ 12,000
Treasury Stock, Shares, Acquired (in shares)	5,751	210,832	416,264	362,170
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)	$ 10.60	$ 8.46	$ 8.40	$ 8.40
Treasury Stock, Value, Acquired, Cost Method	$ 100	$ 1,800	$ 3,500	$ 3,000
Stock Repurchase Plan [Member] | Employees and Directors [Member]
Treasury Stock, Shares, Acquired (in shares)			30,442
2015 Increase [Member]
Stock Repurchase Program, Authorized Amount						$ 3,000
Stock Repurchase Plan In Connection With Restricted Stock [Member]
Treasury Stock, Shares, Acquired (in shares)	38,381	53,176	46,817	61,506
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)	$ 15.05	$ 6.91	$ 13.66	$ 7.14
Treasury Stock, Value, Acquired, Cost Method	$ 600	$ 400	$ 600	$ 400