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Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Net Sales	$ 123,441	$ 127,069
Lighting Segment [Member]
Net Sales	67,641	67,533
Lighting Segment [Member] | Transferred at Point in Time [Member]
Net Sales	57,652	58,077
Lighting Segment [Member] | Transferred over Time [Member]
Net Sales	9,989	9,456
Lighting Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Net Sales	55,491	55,535
Lighting Segment [Member] | Poles, Other Display Solution Elements [Member]
Net Sales	11,383	11,129
Lighting Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Net Sales	767	869
Display Solutions Segment [Member]
Net Sales	55,800	59,536
Display Solutions Segment [Member] | Transferred at Point in Time [Member]
Net Sales	39,988	47,489
Display Solutions Segment [Member] | Transferred over Time [Member]
Net Sales	15,812	12,047
Display Solutions Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Net Sales	8,933	7,175
Display Solutions Segment [Member] | Poles, Other Display Solution Elements [Member]
Net Sales	34,869	41,471
Display Solutions Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Net Sales	$ 11,998	$ 10,890

X

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-URI https://asc.fasb.org//1943274/2147482810/280-10-50-30

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-URI https://asc.fasb.org//1943274/2147482810/280-10-50-42

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Section 50
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-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Publisher FASB
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Section 50
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-Publisher FASB
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
-Paragraph 41
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-4

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