Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Held-to-maturity securities, at fair value	$ 4,148	$ 4,161
Available-for-sale securities, at amortized cost	2,661,561	2,562,786
Equity securities, at amortized cost	70,059	68,559
Trading securities, at amortized cost	15,015	13,429
Allowance for doubtful accounts	700	825
Property and equipment accumulated depreciation	$ 35,275	$ 35,248
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	25,507,809	25,505,350
Common stock, shares outstanding	25,507,809	25,505,350