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Note 6 - Goodwill, Intangible Assets and Long Term Assets Goodwill Activity (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 27, 2016
Mar. 29, 2015
Dec. 31, 2015
Goodwill [Line Items]      
Goodwill - beginning $ 16,283 $ 16,407 $ 16,416
Acquisition of Accutronics 4,407    
Effect of foreign currency translation (106) 9 (133)
Goodwill - ending 20,584 16,416 16,283
Battery & Energy Products      
Goodwill [Line Items]      
Goodwill - beginning 4,790 4,914 4,923
Acquisition of Accutronics 4,407    
Effect of foreign currency translation (106) 9 (133)
Goodwill - ending 9,091 4,923 4,790
Communications Systems      
Goodwill [Line Items]      
Goodwill - beginning 11,493 11,493 11,493
Acquisition of Accutronics 0    
Effect of foreign currency translation 0 0 0
Goodwill - ending $ 11,493 $ 11,493 $ 11,493