Note 3 - Financial Instruments (Details) - Summary of Assets and Liabilities Measured at Fair Value (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financial assets
Assets	$ 21,680	$ 5,140
Financial liabilities
Liabilities	11,903	1,443
Derivative Financial Instruments, Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]
Financial liabilities
Liabilities	11,903	1,443
Derivative Financial Instruments, Liabilities [Member]
Financial liabilities
Liabilities	11,903	1,443
Fair Value, Inputs, Level 1 [Member] | Cash Equivalents [Member]
Financial assets
Assets	3,233	2,781
Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member]
Financial assets
Assets	18,447	2,359
Fair Value, Inputs, Level 1 [Member]
Financial assets
Assets	21,680	5,140
Fair Value, Inputs, Level 3 [Member]
Financial liabilities
Liabilities	11,903	1,443
Cash Equivalents [Member]
Financial assets
Assets	3,233	2,781
US Government Agencies Debt Securities [Member]
Financial assets
Assets	$ 18,447	$ 2,359