Consolidated Balance Sheets Parentheticals - $ / shares |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Preferred stock, shares authorized | 10,000,000 | 10,000,000 |
| Preferred stock, par value per share | $ 0.001 | $ 0.001 |
| Preferred stock, shares issued | 0 | 0 |
| Preferred stock, shares outstanding | 0 | 0 |
| Common stock, par value per share | $ 0.001 | $ 0.001 |
| Common stock, shares authorized | 100,000,000 | 100,000,000 |
| Common stock, shares issued | 50,476,042 | 50,651,239 |
| Common stock, shares outstanding | 50,476,042 | 50,651,239 |
| Treasury stock, shares | 1,729,408 | 1,729,408 |