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11. GE Royalty Obligation (Tables)
3 Months Ended
Mar. 31, 2016
Notes to Financial Statements  
GE Royalty Obligation

Net Sales in Contract Year Percentage of the Contract Year Net Sales owed to GE

  $0 - $50,000,000       7 %
  $50,000,001 - $100,000,000       6 %
  $100,000,001+       5 %