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Note 2 - Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Dec. 31, 2018
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
(
In thousands)
  
December 31
    
December 31
  
   
Lighting
Segment
    
Graphics
Segment
    
Lighting
Segment
    
Graphics
Segment
  
Timing of revenue recognition
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
Products and services transferred at a point in time
   $
 
57,318		     $
14,758
     $
 
111,567		     $
 
32,452		  
Products and services transferred over time
    
6,336
      
 
11,129		      
13,519
      
16,960
  
    $
63,654
     $
25,887
     $
125,086
     $
49,412
  
                                 
Type of Product and Services
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
New technology products
   $
56,271
     $
2,349
     $
107,576
     $
4,751
  
Legacy products
    
6,947
      
18,222
      
16,023
      
34,186
  
Turnkey services and other
    
436
      
5,316
      
1,487
      
10,475
  
    $
63,654
     $
25,887
     $
125,086
     $
49,412
  
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
  
S
tockholders' Equity:
  
 
 
 
  
 
 
 
  
 
 
 
Retained earnings
   $
15,124
     $
591
     $
15,715