Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Common Class A [Member] | ||
| Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |
| Common Class B [Member] | ||
| Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |