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], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, January 1, 2014	$ 2,069
Included in other comprehensive income	169
Balance, March 31, 2014	$ 2,238