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Note 6 - Fair Value of Assets and Liabilities (Tables)
12 Months Ended
Dec. 31, 2015
Note 1 - Summary Of Operations And Significant Accounting Policies  
Assets Measured at Fair Value on a Non-recurring Basis

Assets Measured at Fair Value on a Non-recurring Basis
   Balance, December 31, 2015  Level 1  Level 2  Level 3  Total Gain / (Loss)
Goodwill – Battery & Energy Products Segment  $4,790   $—     $—     $4,790   $—   
Goodwill – Communications Systems Segment   11,493    —      —      11,493    —   
Trademark – Battery & Energy Products Segment   711    —      —      711    —   
Trademarks – Communications Systems Segment   2,700    —      —      2,700    (150)
      Total  $19,694   $—     $—     $19,694   $(150)