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Note 11 - Stock-based Compensation
 3 Months Ended
Mar. 31, 2017
Notes to Financial Statements  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
11.
 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
2016
Form
10
-K for further information. The Company recorded stock-based compensation expense of
$0.6
million for the
three
months ended
March
31,
2017
and
$0.4
million for the
three
months ended
March
31,
2016.
 
At
March
31,
2017,
total unrecognized compensation cost related to unvested common stock awards was
$1.7
million. This cost is expected to be recognized over a weighted average period of
1.4
years. At
March
31,
2017,
there were
0.5
million shares of common stock covered by outstanding unvested common stock.