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Note 9 - Stockholders' Equity
 9 Months Ended
Sep. 30, 2016
Notes to Financial Statements  
Stockholders' Equity Note Disclosure [Text Block]
9. Stockholders’ Equity
 
Stock Offering
 
On May 9, 2016, the Company completed an underwritten public offering of 5,175,000 shares of the Company’s common stock, which included the full exercise of the sole underwriter’s over-allotment option, at a price to the public of $4.00 per share ($3.77 per share net of underwriting discounts). The net proceeds from the offering of $19.1 million, after deducting underwriting discounts and other offering expenses, were used for working capital, repayment of our indebtedness under the revolving loan portion of our Equipment-based Facility and for general corporate purposes.
 
Stock-Based Compensation
 
The Company has a stock-based incentive plan which is administered by the Compensation Committee of the Board of Directors. Refer to Note 14 of the Notes to Consolidated Financial Statements included in the 2015 Form 10-K for further information.
 
During the three and nine months ended September 30, 2016, the Company awarded a total of zero and 79,240 shares of common stock, respectively, at a weighted-average grant date value of zero and $4.36 per share, respectively, based on the closing price of the Company’s common stock on the date of award. The Company recorded stock-based compensation expense of $0.4 million and $1.2 million for the three months and nine months ended September 30, 2016, respectively, and $0.8 million and $1.3 million for the three and nine months ended September 30, 2015, respectively.
 
At September 30, 2016, total unrecognized compensation cost related to unvested common stock awards was $2.3 million. This cost is expected to be recognized over a weighted average period of 1.5 years. At September 30, 2016, there were 0.8 million shares of common stock covered by outstanding unvested common stock.