Note 10 - Fair Value Measurements (Details) - Level 3 Investments $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at January 1, 2015	$ 5,389
Ending balance at June 30, 2015	5,375
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	(14)
Ending balance at June 30, 2015	$ 5,375