Consolidated Balance Sheets (Parentheticals) - USD ($) |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Current assets: | ||
| Allowance for doubtful accounts | $ 1,507,016 | $ 1,627,315 |
| Customer relationships and other intangible assets, accumulated amortization | $ 38,680,343 | $ 26,785,810 |
| Stockholders' equity: | ||
| Common stock, par value (in usd per share) | $ 0.0001 | $ 0.0001 |
| Common stock, shares authorized (in shares) | 100,000,000 | 100,000,000 |
| Common stock, shares issued (in shares) | 30,351,479 | 29,765,525 |
| Common stock, shares outstanding (in shares) | 28,635,197 | 29,727,588 |
| Treasury stock, shares (in shares) | 1,716,282 | 37,937 |