Note 5 - Property and Equipment (Details Textual) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Depreciation | $ 21,699 | $ 20,234 | $ 14,051 |
| Asset Impairment Charges | 21,003 | 1,593 | 6,915 |
| Holding Company Office Space in Arizona [Member] | |||
| Asset Impairment Charges | 1,415 | ||
| Property and Equipment [Member] | WD Services [Member] | |||
| Asset Impairment Charges | 9,983 | ||
| Continuing Operations [Member] | |||
| Depreciation | $ 18,038 | $ 14,488 | $ 10,241 |