Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Net sales	$ 150,525	$ 132,481	$ 454,776	$ 418,310
Lighting Segment [Member]
Net sales	60,038	58,967	195,764	175,614
Lighting Segment [Member] \| Lighting, Poles, and Electronic Components [Member]
Net sales	59,450	58,363	193,995	173,710
Lighting Segment [Member] \| Signage and Display Products [Member]
Net sales	0	0	0	0
Lighting Segment [Member] \| Project Management, Installation Services, Shipping and Handling [Member]
Net sales	588	604	1,769	1,904
Display Solutions Segment [Member]
Net sales	90,487	73,514	259,012	242,696
Display Solutions Segment [Member] \| Lighting, Poles, and Electronic Components [Member]
Net sales	0	0	0	0
Display Solutions Segment [Member] \| Signage and Display Products [Member]
Net sales	76,134	58,459	216,302	192,634
Display Solutions Segment [Member] \| Project Management, Installation Services, Shipping and Handling [Member]
Net sales	14,353	15,055	42,710	50,062
Transferred at Point in Time [Member] \| Lighting Segment [Member]
Net sales	48,843	49,258	161,877	145,835
Transferred at Point in Time [Member] \| Display Solutions Segment [Member]
Net sales	79,350	60,215	224,557	190,355
Transferred over Time [Member] \| Lighting Segment [Member]
Net sales	11,195	9,709	33,887	29,779
Transferred over Time [Member] \| Display Solutions Segment [Member]
Net sales	$ 11,137	$ 13,299	$ 34,455	$ 52,341

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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+ Details