Note 10 - Restricted Cash and Performance Bonds (Details) - Restricted Cash (Parentheticals) (USD $) In Millions, unless otherwise specified	Jan. 31, 2011	Dec. 31, 2014	Dec. 31, 2013
Restricted Cash and Cash Equivalents Items [Line Items]
Secured debt facility	$ 40.0
Performance Bonds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Performance bond		5.7	5.7
$40 Million Secured Debt Facility [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Secured debt facility		40.0	40.0
Unsecured Performance Bond [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Performance bond		$ 0.1	$ 0.1