Note 3 - Business Segment Information (Details Textual) $ in Thousands	12 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Number of Operating Segments	2
Revenue from Contract with Customer, Including Assessed Tax	$ 315,612	$ 305,558
Intersegment Revenue Markup Percentage	10.00%
Display Solutions Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 126,612	$ 99,359
Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Number of Major Customers		0
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Display Solutions Segment [Member] | One Customer [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 32,400
Concentration Risk, Percentage	10.30%
Number of Major Customers	1
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Number of Major Customers	0	0