Note 14 - Business Segments - Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Jun. 30, 2021
Net Revenue	$ 11,138	$ 8,112	$ 32,231	$ 23,154
Operating Income / (loss)	(130)	(65)	1,496	(429)
Assets	41,803	39,125	41,803	39,125	$ 38,306
Depreciation and amortization	761	755	2,263	2,224
Capital expenditures	349	404	1,144	621
Manufacturing [Member]
Net Revenue	3,097	3,130	10,187	9,324
Operating Income / (loss)	(145)	214	107	277
Assets	14,204	12,576	14,204	12,576
Depreciation and amortization	110	98	318	310
Capital expenditures	8	60	103	214
Testing Services [Member]
Net Revenue	4,417	3,504	13,983	10,018
Operating Income / (loss)	(124)	(320)	1,000	(993)
Assets	24,030	21,364	24,030	21,364
Depreciation and amortization	633	637	1,884	1,859
Capital expenditures	341	344	1,040	407
Distribution [Member]
Net Revenue	3,620	1,467	8,038	3,790
Operating Income / (loss)	576	163	1,108	407
Assets	1,601	983	1,601	983
Depreciation and amortization	(2)	0	0	0
Real Estate Segment [Member]
Net Revenue	4	11	23	22
Operating Income / (loss)	(35)	(23)	(86)	(84)
Assets	1,730	3,784	1,730	3,784
Depreciation and amortization	20	20	61	55
Capital expenditures			1
Corporate and Unallocated [Member]
Operating Income / (loss)	(402)	(99)	(632)	(36)
Assets	238	418	238	418
Depreciation and amortization	$ 0	$ 0	$ 0	$ 0