Note J - Treasury Stock (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Mar. 13, 2020	Jan. 08, 2020
Treasury Stock, Value, Acquired, Cost Method	$ 2,150,000	$ 511,000	$ 3,482,000	$ 941,000
Stock Repurchase Plan [Member]
Stock Repurchase Program, Additional Amount Authorized					$ 1,000,000	$ 2,000,000
Stock Repurchase Program, Authorized Amount					$ 10,000,000	$ 9,000,000
Treasury Stock, Shares, Acquired (in shares)	210,832	5,748	362,170	42,697
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)	$ 8.46	$ 10.17	$ 8.40	$ 9.74
Treasury Stock, Value, Acquired, Cost Method	$ 1,800,000	$ 58,000	$ 3,000,000	$ 416,000
Stock Repurchase Plan In Connection With Restricted Stock [Member]
Treasury Stock, Shares, Acquired (in shares)	53,176	39,118	61,506	46,656
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)	$ 6.91	$ 11.58	$ 7.14	$ 11.27
Treasury Stock, Value, Acquired, Cost Method	$ 367,000	$ 453,000	$ 439,000	$ 525,000