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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