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Note 3 - Investment Write-down
3 Months Ended
Mar. 31, 2016
Notes to Financial Statements  
Cost-method Investments, Description [Text Block]
3.
Investment Write-down
– In the quarter ended March 31, 2016, we recorded an impairment charge of $700,000 to reduce the carrying value of our minority equity ownership in Lumense, Inc., an early stage sensor technology company, to $50,000. Given Lumense’s limited funding to support its operation and product development, we are not comfortable assigning a higher realizable value to our investment in Lumense at this point and therefore believe an impairment charge is prudent and required.