Note 10 - Fair Value Measurement (Details) - Level 3 Investments (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at January 1, 2015		$ 5,389
Ending balance at March 31, 2015	5,394	5,389
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at January 1, 2015	5,389
Change in unrealized loss included in other comprehensive income	5
Ending balance at March 31, 2015	$ 5,394