Note 6 - Severance Activity (Details) - Employee Severance [Member] $ in Thousands  | 
3 Months Ended | 
|---|---|
| 
 Mar. 31, 2016  
USD ($) 
 | |
| Continuing Operations [Member] | |
| Balance as of December 31, 2015 | $ 2,011 | 
| Accruals | 459 | 
| Payments | (140) | 
| Balance as of March 31, 2016 | 2,330 | 
| Discontinued Operations [Member] | |
| Balance as of December 31, 2015 | 1,074 | 
| Accruals | 659 | 
| Payments | (388) | 
| Balance as of March 31, 2016 | 1,345 | 
| Balance as of December 31, 2015 | 3,085 | 
| Accruals | 1,118 | 
| Payments | (528) | 
| Balance as of March 31, 2016 | $ 3,675 | 
| X | ||||||||||
- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
| X | ||||||||||
- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
| X | ||||||||||
- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
| X | ||||||||||
- Details 
  | 
| X | ||||||||||
- Details 
  | 
| X | ||||||||||
- Details 
  |