CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands |
Jun. 30, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Class of Stock [Line Items] | ||
| Common Stock, Value | $ 1,425 | $ 1,437 |
| Common Class A [Member] | ||
| Class of Stock [Line Items] | ||
| Common Stock, Value | 1,385 | 1,397 |
| Common Class B [Member] | ||
| Class of Stock [Line Items] | ||
| Common Stock, Value | 40 | 40 |
| Common Class C Member | ||
| Class of Stock [Line Items] | ||
| Common Stock, Value | $ 0 | $ 0 |