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Note 12 - Segment Data (Details) - Financial Information From Reportable Segments - Income Statement (USD $)
 3 Months Ended 6 Months Ended
Jun. 29, 2014
Jun. 30, 2013
Jun. 29, 2014
Jun. 30, 2013
Net revenue from unaffiliated customers:        
Net revenue $ 93,113,000 $ 82,166,000 $ 177,357,000 $ 160,577,000
Gross profit (loss):        
Gross profit 10,827,000 8,336,000 21,391,000 16,412,000
Operating income (loss):        
Operating Income (loss) 1,676,000 (689,000) 4,097,000 (7,570,000)
Industrial Group [Member]
        
Net revenue from unaffiliated customers:        
Net revenue 83,710,000 74,432,000 159,549,000 145,581,000
Gross profit (loss):        
Gross profit 11,383,000 8,858,000 22,537,000 16,968,000
Operating income (loss):        
Operating Income (loss) 7,040,000 5,976,000 15,153,000 11,361,000
Electronics Group [Member]
        
Net revenue from unaffiliated customers:        
Net revenue 9,403,000 7,734,000 17,808,000 14,996,000
Gross profit (loss):        
Gross profit (556,000) (522,000) (1,146,000) (556,000)
Operating income (loss):        
Operating Income (loss) (3,168,000) (4,444,000) (6,245,000) (14,595,000)
General, Corporate and Other [Member]
        
Operating income (loss):        
Operating Income (loss) $ (2,196,000) $ (2,221,000) $ (4,811,000) $ (4,336,000)