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Note 4 - Significant Customers (Details) - Sales Revenue, Net [Member] - Customer Concentration Risk [Member] | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Samsung Display Co., Ltd. [Member] |  |  |
Note 4 - Significant Customers (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 11.00% | 14.00% |
AU Optronics Corporation [Member] |  |  |
Note 4 - Significant Customers (Details) [Line Items] |  |  |
Concentration Risk, Percentage |  |  | 10.00%

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