Consolidated Balance Sheets (Parentheticals) - USD ($) |
Dec. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Accounts receivable, allowance | $ 1,993 | $ 2,077 |
| Preferred stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |
| Preferred stock, shares authorized (in shares) | 50,000,000 | 50,000,000 |
| Preferred stock, shares issued (in shares) | 0 | 0 |
| Preferred stock, shares outstanding (in shares) | 0 | 0 |
| Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |
| Common stock, shares authorized (in shares) | 450,000,000 | 450,000,000 |
| Common stock, shares issued (in shares) | 36,943,770 | 36,494,002 |
| Common stock, shares outstanding (in shares) | 36,943,770 | 36,494,002 |