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Note 2 - Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Mar. 31, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three Months Ended
    
Nine Months Ended
  
(
In thousands)
  
March 31, 2019
    
March 31, 2019
  
   
Lighting
Segment
    
Graphics
Segment
    
Lighting
Segment
    
Graphics
Segment
  
Timing of revenue recognition
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Products and services transferred at a point in time
   $
46,364
     $
10,339
     $
157,931
     $
42,790
  
Products and services transferred over time
    
6,421
      
9,708
      
19,940
      
26,669
  
    $
52,785
     $
20,047
     $
177,871
     $
69,459
  
                                 
Type of Product and Services
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Current technology products
   $
46,195
     $
4,427
     $
153,771
     $
9,178
  
Legacy products
    
6,133
      
11,160
      
22,156
      
45,346
  
Turnkey services and other
    
457
      
4,460
      
1,944
      
14,935
  
    $
52,785
     $
20,047
     $
177,871
     $
69,459
  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
(
In thousands)
  
Balance as of
June 30, 2018
    
Adjustments
    
Opening Balance as
of July 1, 2018
  
Assets:
                        
Accounts receivable, net
   $
50,609
     $
4,935
     $
55,544
  
Inventories, net
   $
50,994
     $
(4,167
)
   $
46,827
  
Other long-term assets, net
   $
9,786
     $
(177
)
   $
9,609
  
Shareholders' Equity:
  
 
 
 
  
 
 
 
  
 
 
 
Retained earnings
   $
15,124
     $
591
     $
15,715