Note 14 - Business Segments - Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024
Revenues	$ 9,799	$ 9,966
Gross Profit / (Loss)	2,322	2,520
Operating Income / (Loss)	133	(1)
Total Assets	42,940	44,699	$ 42,540
Depreciation and Amortization	711	1,471
Capital Expenditures	133	77
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Revenues	6	7
Gross Profit / (Loss)	(11)	(10)
Operating Income / (Loss)	(37)	(151)
Total Assets	2,878	2,121
Depreciation and Amortization	17	18
Capital Expenditures	0	0
Semiconductor Back-end Solutions [Member] | Operating Segments [Member]
Revenues	6,879	7,176
Gross Profit / (Loss)	1,794	1,880
Operating Income / (Loss)	177	(40)
Total Assets	33,765	34,102
Depreciation and Amortization	636	1,385
Capital Expenditures	133	77
Industrial Electronics [Member] | Operating Segments [Member]
Revenues	2,914	2,783
Gross Profit / (Loss)	539	650
Operating Income / (Loss)	(7)	190
Total Assets	6,297	8,476
Depreciation and Amortization	58	68
Capital Expenditures	$ 0	$ 0