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Consolidated Statements of Stockholders' Equity (Parentheticals) - shares shares in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Common Stock [Member] |  |  |
Exercise of stock options, shares (in shares) | 1,359 | 1,314 | 348
Employee stock purchase plan sales, shares (in shares) | 41 | 49 | 89
Issuance of common stock, shares (in shares) |  | 11,500 | 7,547
Exercise of stock options, shares (in shares) | 1,118 | 1,258 | 563
Issuance of common stock, shares (in shares) |  |  | 2,883

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