Note 14 - Business Segments - Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022
Revenues	$ 11,939	$ 10,171
Operating Income / (loss)	1,067	970
Assets	43,805	40,111	$ 43,421
Depreciation and amortization	882	709
Capital expenditures	1,156	438
Net Revenue	1,156	438
Corporate, Non-Segment [Member]
Revenues		0
Operating Income / (loss)	(447)	(97)
Assets	151	314
Depreciation and amortization	0	0
Capital expenditures	0	0
Net Revenue	0	0
Manufacturing [Member]
Revenues	3,585	3,562
Manufacturing [Member] | Operating Segments [Member]
Revenues	3,585	3,562
Operating Income / (loss)	176	300
Assets	12,791	18,558
Depreciation and amortization	97	103
Capital expenditures	0	60
Net Revenue	0	60
Testing Services [Member]
Revenues	6,364	4,600
Testing Services [Member] | Operating Segments [Member]
Revenues	6,364	4,600
Operating Income / (loss)	1,087	536
Assets	27,770	18,363
Depreciation and amortization	767	585
Capital expenditures	1,156	377
Net Revenue	1,156	377
Distribution [Member]
Revenues	1,982	1,998
Distribution [Member] | Operating Segments [Member]
Revenues	1,982	1,998
Operating Income / (loss)	265	254
Assets	1,603	1,288
Depreciation and amortization	0	2
Capital expenditures	0	0
Net Revenue	0	0
Real Estate Segment [Member]
Revenues	8	11
Real Estate Segment [Member] | Operating Segments [Member]
Revenues	8	11
Operating Income / (loss)	(14)	(23)
Assets	1,490	1,588
Depreciation and amortization	18	19
Capital expenditures	0	1
Net Revenue	$ 0	$ 1