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Note 5 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, shares in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 03, 2014 | Aug. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 03, 2015 | Jun. 30, 2014 | Nov. 06, 2013 | Jul. 13, 2011
Maximum Aggregate Offering Price |  |  |  |  |  |  | $ 150,000,000 |  | $ 125,000,000 |
Issuance of common stock, shares (in shares) | 11,500 | 4,600 |  |  | 2,883 | 4,516 |  |  |  |
Proceeds from Issuance of Common Stock | $ 115,000,000 | $ 18,500,000 |  | $ 106,600,000 | $ 23,633,000 | $ 17,805,000 |  |  |  |
Proceeds from Issuance or Sale of Equity | $ 107,800,000 |  |  |  |  |  |  |  |  |
Remaining Aggregate Offering Price |  |  |  |  |  |  |  |  | $ 10,000,000 |
Share Price |  | $ 4.40 |  |  | $ 1.85 | $ 4.08 |  |  |  |
Stock Issued During Period Shares for over Allotment Option Exercised by Underwriter |  | 600 |  |  |  |  |  |  |  |
Common Stock to be Issued, Value |  |  |  |  |  |  |  | $ 70,000,000 |  |
Common Stock, Value, Issued |  |  | $ 734,000 | $ 720,000 |  |  |  |  |  | $ 70,000,000
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options |  |  |  |  | $ 5,218,000 |  |  |  |  |

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