Note C - Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Property and equipment, gross	$ 66,618	$ 61,952
Less: accumulated depreciation and amortization	(44,347)	(40,429)
Property and equipment, net	$ 22,271	21,523
Minimum [Member]
Depreciable Life In Years (Year)	1 year
Maximum [Member]
Depreciable Life In Years (Year)	39 years
Land [Member]
Property and equipment, gross	$ 1,200	1,200
Building and Building Improvements [Member]
Property and equipment, gross	$ 3,757	3,743
Building and Building Improvements [Member] \| Minimum [Member]
Depreciable Life In Years (Year)	7 years
Building and Building Improvements [Member] \| Maximum [Member]
Depreciable Life In Years (Year)	39 years
Machinery and Equipment [Member]
Property and equipment, gross	$ 35,458	33,405
Machinery and Equipment [Member] \| Minimum [Member]
Depreciable Life In Years (Year)	3 years
Machinery and Equipment [Member] \| Maximum [Member]
Depreciable Life In Years (Year)	12 years
Office Equipment [Member]
Property and equipment, gross	$ 5,712	5,318
Office Equipment [Member] \| Minimum [Member]
Depreciable Life In Years (Year)	3 years
Office Equipment [Member] \| Maximum [Member]
Depreciable Life In Years (Year)	5 years
Vehicles [Member]
Property and equipment, gross	$ 255	255
Depreciable Life In Years (Year)	3 years
Leasehold Improvements [Member]
Property and equipment, gross	$ 20,236	$ 18,031
Leasehold Improvements [Member] \| Minimum [Member]
Depreciable Life In Years (Year)	1 year
Leasehold Improvements [Member] \| Maximum [Member]
Depreciable Life In Years (Year)	15 years

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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