Note G - Employee Benefit Plans - Defined Benefit Pension Plan's Funded Status and Amount Recognized (Details) - USD ($)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Change in Benefit Obligation:
Benefit obligation at beginning of year	$ 1,804,000	$ 2,329,000
Interest cost	57,000	70,000
Actuarial (gain) loss	(24,000)	(189,000)
Benefits paid	(339,000)	(406,000)
Benefit obligation at end of year	1,498,000	1,804,000
Change in Plan Assets:
Fair value of plan assets at beginning of year	1,247,000	1,571,000
Actual return on plan assets	83,000	117,000
Defined Benefit Plan, Plan Assets, Contributions by Employer	500,000
Benefits paid	(339,000)	(406,000)
Plan expenses	(38,000)	(35,000)
Fair value of plan assets at end of year	1,453,000	1,247,000
Reconciliation of Funded Status:
Difference between benefit obligation and fair value of plan assets	(45,000)	(557,000)
Unrecognized net actuarial loss in accumulated other comprehensive income	523,000	671,000
Net amount recognized	478,000	114,000
Projected benefit obligation	1,498,000	1,804,000
Accumulated benefit obligation	1,498,000	1,804,000
Fair value of plan assets	$ 1,453,000	$ 1,247,000