Note 14 - Business Segments - Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2024
Revenues	$ 8,619	$ 12,202	$ 18,418	$ 22,168
Gross Profit / (Loss)	2,218	2,854	4,540	5,374
Operating Income / (Loss)	(3)	677	130	676
Total Assets	39,800	46,598	39,800	46,598	$ 42,540
Depreciation and Amortization	711	1,313	1,422	2,784
Capital Expenditures	119	81	252	158
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Revenues	9	6	15	13
Gross Profit / (Loss)	(9)	(13)	(20)	(23)
Operating Income / (Loss)	(77)	41	(114)	(110)
Total Assets	2,826	2,914	2,826	2,914
Depreciation and Amortization	17	17	34	35
Capital Expenditures		0	0	0
Semiconductor Back-end Solutions [Member] | Operating Segments [Member]
Revenues	5,809	7,896	12,688	15,072
Gross Profit / (Loss)	1,742	1,982	3,536	3,862
Operating Income / (Loss)	97	342	274	302
Total Assets	30,704	35,508	30,704	35,508
Depreciation and Amortization	639	1,239	1,275	2,624
Capital Expenditures	119	81	252	158
Industrial Electronics [Member] | Operating Segments [Member]
Revenues	2,801	4,300	5,715	7,083
Gross Profit / (Loss)	485	885	1,024	1,535
Operating Income / (Loss)	(23)	294	(30)	484
Total Assets	6,270	8,176	6,270	8,176
Depreciation and Amortization	55	57	113	125
Capital Expenditures		$ 0	$ 0	$ 0