Note 8 - Matching Contributions (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
401(k) plan (in shares)	1,898	2,341	5,235
401(k) plan	$ 26	$ 25	$ 28

Value of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.

No definition available.

Name:	us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration