Note 8 - Acquisitions - Net Gain on Previously Owned Equity (Details) (Parentheticals) - Samsung Corning Precision Materials Co., Ltd. [Member]	12 Months Ended
Dec. 31, 2014
Equity Method Investment, Ownership Percentage	57.50%
Pre-acquisition fair value of assets, Percent	57.50%

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant