Consolidated Statements of Stockholders’ Equity (June 30, 2012 and 2013 Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Exercise of stock options, shares	4,000	0
Common Stock [Member]
Stock issued as bonus, shares	64,006	51,245
Employee stock purchase plan, stock issued	5,244	5,103
Repurchase of common stock - Shares	326,789	311,674	414,213
Exercise of stock options, shares	4,000
Accumulated Other Comprehensive Income (Loss) [Member]
Change in unrealized appreciation on available-for-sale securities, income tax portion (in Dollars)	$ 1,721	$ 40	$ 77
Retained Earnings [Member]
Dividends paid per share (in Dollars per share)	$ 0.42	$ 0.40	$ 0.40