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Note 4 - Supplemental Balance Sheet Information - Summary of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Goodwill balance $ 16,283 $ 16,407
Effect of Foreign Currency Translation (805) (124)
Goodwill balance 19,965 16,283
Accutronics Limited [Member]    
Acquisition of Accutronics 4,487  
Battery & Energy Products Segment [Member]    
Goodwill balance 4,790 4,914
Effect of Foreign Currency Translation (805) (124)
Goodwill balance 8,472 4,790
Battery & Energy Products Segment [Member] | Accutronics Limited [Member]    
Acquisition of Accutronics 4,487  
Communications Systems Segment [Member]    
Goodwill balance 11,493 11,493
Effect of Foreign Currency Translation
Goodwill balance 11,493 $ 11,493
Communications Systems Segment [Member] | Accutronics Limited [Member]    
Acquisition of Accutronics