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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2016
Jan. 15, 2014
Jan. 15, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Nov. 30, 2013
Equity Method Investment Ownership Percentage Minimum       20.00%        
Equity Method Investment Ownership Percentage Maximum       50.00%        
Minimum Voting Securities Owned       20.00%        
Equity Method Investments $ 4,800,000     $ 269,000 $ 1,905,000      
Research and Development Expense       637,000 638,000 $ 701,000    
Foreign Currency Transaction Gain (Loss), before Tax       21,000 (22,000) (60,000)    
Interest Costs Capitalized       $ 23,000 35,000 $ 40,000    
Benchmark Percentage of Benefit Obligation or Market Related Value of Plan Assets       10.00%        
Minimum [Member]                
Finite-Lived Intangible Asset, Useful Life       4 years        
Maximum [Member]                
Finite-Lived Intangible Asset, Useful Life       50 years        
Building [Member] | Minimum [Member]                
Property, Plant and Equipment, Useful Life       10 years        
Building [Member] | Maximum [Member]                
Property, Plant and Equipment, Useful Life       40 years        
Equipment [Member] | Minimum [Member]                
Property, Plant and Equipment, Useful Life       2 years        
Equipment [Member] | Maximum [Member]                
Property, Plant and Equipment, Useful Life       20 years        
Samsung Corning Precision Materials Co., Ltd. [Member]                
Sale of Stock, Percentage of Ownership after Transaction   100.00% 100.00%          
Equity Method Investment, Ownership Percentage             57.50% 50.00%
Dow Corning Corporation [Member]                
Equity Method Investment, Ownership Percentage 50.00%              
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions 100.00%              
Equity Method Investments $ 4,800,000     $ 0 [1] $ 1,483,000 [1]      
[1] Amount reflects Corning’s direct ownership interest in Dow Corning at December 31, 2015. Corning did not control Dow Corning.