Note J - Treasury Stock (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Sep. 18, 2020
Treasury Stock, Value, Acquired, Cost Method	$ 1,758,000	$ 1,317,000	$ 3,501,000	$ 1,332,000
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)	175,123	150,307	410,513	151,338
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)	$ 9.72	$ 8.33	$ 8.38	$ 8.33
Treasury Stock, Value, Acquired, Cost Method	$ 1,700,000	$ 1,300,000	$ 3,400,000	$ 1,300,000
Stock Repurchase Plan [Member] | Employees and Directors [Member]
Treasury Stock, Shares, Acquired (in shares)	30,442		30,442
Stock Repurchase Plan In Connection With Restricted Stock [Member]
Treasury Stock, Shares, Acquired (in shares)	7,744	7,644	8,436	8,330
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)	$ 7.40	$ 8.67	$ 7.34	$ 8.74
Treasury Stock, Value, Acquired, Cost Method	$ 57,000	$ 66,000	$ 62,000	$ 73,000