UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands |
Sep. 30, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Accounts receivable, allowance for doubtful accounts (in dollars) | $ 583 | $ 767 |
| Preferred stock, no par value (in dollars per share) | $ 0 | $ 0 |
| Preferred stock, shares authorized | 3,000 | 3,000 |
| Preferred stock, shares issued | 0 | 0 |
| Treasury stock, at cost, shares | 1,463 | 1,327 |
| Class A Common Stock | ||
| Common stock, no par value (in dollars per share) | $ 0 | $ 0 |
| Common stock, shares authorized | 30,000 | 30,000 |
| Common stock, shares issued | 21,138 | 20,935 |
| Common stock, shares outstanding | 19,675 | 19,608 |
| Class B Common Stock | ||
| Common stock, no par value (in dollars per share) | $ 0 | $ 0 |
| Common stock, shares authorized | 5,000 | 5,000 |
| Common stock, shares issued | 0 | 0 |