Note 9 - Fair Value Measurements and Disclosures (Details) - Available-for-sale Securities Measured at Fair Value Using Significant Unobservable Inputs - Fair Value, Inputs, Level 3 [Member] $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, January 1, 2015	$ 2,439
Payments received	(18)
Total gains or losses (realized/unrealized)
Included in other comprehensive income	273
Balance, June 30, 2015	$ 2,694