CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands |
Dec. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Class of Stock [Line Items] | ||
| Common Stock, Value | $ 1,412 | $ 1,437 |
| Common Class A [Member] | ||
| Class of Stock [Line Items] | ||
| Common Stock, Value | $ 1,372 | $ 1,397 |
| Common Stock, Par Value Per Share | $ 0.01 | $ 0.01 |
| Common Stock, Shares Authorized | 200,000,000 | 200,000,000 |
| Common Stock, Shares Issued and Outstanding | 137,180,213 | 139,675,781 |
| Common Class B [Member] | ||
| Class of Stock [Line Items] | ||
| Common Stock, Value | $ 40 | $ 40 |
| Common Stock, Par Value Per Share | $ 0.01 | $ 0.01 |
| Common Stock, Shares Authorized | 75,000,000 | 75,000,000 |
| Common Stock, Shares Issued and Outstanding | 4,045,199 | 4,045,199 |
| Common Class C Member | ||
| Class of Stock [Line Items] | ||
| Common Stock, Value | $ 0 | $ 0 |
| Common Stock, Par Value Per Share | $ 0.01 | $ 0.01 |
| Common Stock, Shares Authorized | 50,000,000 | 50,000,000 |
| Common Stock, Shares Issued and Outstanding | 0 | 0 |