Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Statement of Stockholders' Equity [Abstract] | |||
| Income tax benefit on exercise of stock options | $ 335 | $ 175 | $ 42 |
| Capitalized issuance costs | $ 260 | ||