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Note 10 - Segment Data (Details) - Financial Information from Reportable Segments (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Total assets:    
Total assets $ 165,723 $ 160,968
Industrial Group [Member]
   
Total assets:    
Total assets 121,857 114,268
Electronics Group [Member]
   
Total assets:    
Total assets 30,522 38,852
General, Corporate and Other [Member]
   
Total assets:    
Total assets $ 13,344 $ 7,848