Note H - Employee Benefit Plans - Defined Benefit Pension Plan's Funded Status and Amount Recognized (Details) - USD ($)		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Change in Benefit Obligation:
Benefit obligation at beginning of year		$ 1,615,000	$ 1,498,000
Interest cost	$ 57,000	46,000	57,000
Actuarial loss		380,000	173,000
Benefits paid		(6,000)	(113,000)
Benefit obligation at end of year	1,615,000	2,035,000	1,615,000
Change in Plan Assets:
Fair value of plan assets at beginning of year		1,369,000	1,453,000
Actual return on plan assets		(24,000)	69,000
Defined Benefit Plan, Plan Assets, Contributions by Employer		0	0
Benefits paid		(6,000)	(114,000)
Plan expenses	(39,000)		(39,000)
Fair value of plan assets at end of year	1,369,000	1,339,000	1,369,000
Reconciliation of Funded Status:
Difference between benefit obligation and fair value of plan assets	(246,000)	(696,000)	(246,000)
Unrecognized net actuarial loss in accumulated other comprehensive income	671,000	1,087,000	671,000
Net amount recognized	425,000	391,000	425,000
Projected benefit obligation	1,615,000	2,035,000	1,615,000
Accumulated benefit obligation	1,615,000	2,035,000	1,615,000
Fair value of plan assets	$ 1,369,000	$ 1,339,000	$ 1,369,000