Note N - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2021
Deferred Tax Assets, Valuation Allowance	$ 23,097	$ 23,097	$ 24,420
Effective Income Tax Rate Reconciliation, Executive Compensation		42	0
Effective Income Tax Rate Reconciliation, GILTI, Amount		920	0
Undistributed Earnings of Foreign Subsidiaries	14,175	14,175	10,871
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	716	716	778
Unrecognized Tax Benefits, Income Tax Penalties Accrued	38	38	$ 141
Rolla and TD China [Member]
Effective Income Tax Rate Reconciliation, GILTI, Amount	$ 4,900
Rolla and TD China [Member] | Maximum [Member]
Effective Income Tax Rate Reconciliation, GILTI, Percent	18.90%
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Subject to Expiration	$ 26,154	26,154
Tax Credit Carryforward, Amount	9,738	9,738
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Subject to Expiration	30,901	30,901
Tax Credit Carryforward, Amount	$ 935	$ 935