Note J - Treasury Stock (Details Textual) - USD ($)	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 18, 2020
Treasury Stock, Value, Acquired, Cost Method	$ 1,743,000	$ 15,000
Stock Repurchase Plan [Member]
Stock Repurchase Program, Additional Amount Authorized			$ 2,000,000
Stock Repurchase Program, Authorized Amount			$ 12,000,000
Treasury Stock, Shares, Acquired (in shares)	235,390	1,031
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)	$ 7.38	$ 8.44
Treasury Stock, Value, Acquired, Cost Method	$ 1,700,000	$ 8,700
Stock Repurchase Plan In Connection With Restricted Stock [Member]
Treasury Stock, Shares, Acquired (in shares)	692	686
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)	$ 6.74	$ 9.90
Treasury Stock, Value, Acquired, Cost Method	$ 5,000	$ 7,000