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Note 9 - Stockholder's Equity (Details Textual) - $ / shares
Aug. 11, 2014
Dec. 17, 1998
Feb. 02, 2016
Dec. 31, 2015
Dec. 31, 2014
II-VI [Member] | Subsequent Event [Member] | Business Acquired under the Merger Agreement [Member]          
Business Acquisition, Share Price     $ 0.85    
Business Acquisition, Percentage of Voting Interests Acquired     53.00%    
Number of Rights Distributed as Dividend per Share   1      
Common Stock, Par or Stated Value Per Share   $ 0.01   $ 0.01 $ 0.01
Bid Price Consecutive Days 10 days        
Period to Regain Compliance with NASDAQ 180 days