Note J - Treasury Stock (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Jan. 08, 2020
Treasury Stock, Value, Acquired, Cost Method	$ 1,317,000	$ 424,000	$ 1,332,000	$ 430,000
Stock Repurchase Plan [Member]
Stock Repurchase Program, Authorized Amount	$ 7,000,000		$ 7,000,000
Treasury Stock, Shares, Acquired	150,307	36,949	151,338	36,949
Treasury Stock Acquired, Average Cost Per Share	$ 8.33		$ 8.33
Treasury Stock, Value, Acquired, Cost Method	$ 1,300,000	$ 358,000	$ 1,300,000	$ 358,000
Stock Repurchase Plan [Member] | Subsequent Event [Member]
Stock Repurchase Program, Authorized Amount					$ 9,000,000
Stock Repurchase Program, Additional Amount Authorized					$ 2,000,000
Stock Repurchase Plan In Connection With Restricted Stock [Member]
Treasury Stock, Shares, Acquired	7,644	6,864	8,330	7,538
Treasury Stock Acquired, Average Cost Per Share	$ 8.67	$ 9.66	$ 8.74	$ 9.66
Treasury Stock, Value, Acquired, Cost Method	$ 66,000	$ 66,000	$ 73,000	$ 72,000