Note 14 - Business Segments - Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Jun. 30, 2022
Revenues	$ 9,842	$ 11,138	$ 34,171	$ 32,231
Operating Income / (loss)	(37)	(130)	2,099	1,496
Assets	45,374	41,803	45,374	41,803	$ 43,421
Depreciation and amortization	1,498	761	3,641	2,263
Capital expenditures	83	349	4,077	1,144
Corporate, Non-Segment [Member]
Revenues	0	0	0	0
Operating Income / (loss)	(87)	(402)	(276)	(632)
Assets	641	238	641	238
Depreciation and amortization	0	0	0	0
Capital expenditures	14	0	26	0
Manufacturing [Member]
Revenues	2,963	3,097	11,592	10,187
Manufacturing [Member] | Operating Segments [Member]
Revenues	2,963	3,097	11,592	10,187
Operating Income / (loss)	(104)	(145)	373	108
Assets	15,056	14,204	15,056	14,204
Depreciation and amortization	135	110	365	318
Capital expenditures	3	8	18	103
Testing Services [Member]
Revenues	5,697	4,417	17,709	13,983
Testing Services [Member] | Operating Segments [Member]
Revenues	5,697	4,417	17,709	13,983
Operating Income / (loss)	37	(124)	1,445	999
Assets	26,522	24,030	26,522	24,030
Depreciation and amortization	1,343	633	3,218	1,884
Capital expenditures	66	341	4,033	1,040
Distribution [Member]
Revenues	1,179	3,620	4,855	8,038
Distribution [Member] | Operating Segments [Member]
Revenues	1,179	3,620	4,855	8,038
Operating Income / (loss)	151	576	633	1,107
Assets	1,283	1,601	1,283	1,601
Depreciation and amortization	0	(2)	0	0
Capital expenditures	0	0	0	0
Real Estate Segment [Member]
Revenues	3	4	15	23
Real Estate Segment [Member] | Operating Segments [Member]
Revenues	3	4	15	23
Operating Income / (loss)	(34)	(35)	(76)	(86)
Assets	1,872	1,730	1,872	1,730
Depreciation and amortization	20	20	58	61
Capital expenditures	$ 0	$ 0	$ 0	$ 1