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	6 Months Ended
	Jun. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of year	$ 1,962
Settlements	0
Total gains or losses (realized/unrealized)
Included in earnings	0
Included in other comprehensive income	129
Transfers in and/or out of Level 3	0
Balance, June 30, 2013	$ 2,091