Note 7 - Dividends (Detail) (USD $)	4 Months Ended	12 Months Ended			1 Months Ended				12 Months Ended	1 Months Ended
	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Paid Quarterly [Member]	Sep. 30, 2012 Paid Quarterly [Member]	May 31, 2012 Paid Quarterly [Member]	Mar. 31, 2012 Paid Quarterly [Member]	Dec. 31, 2011 Paid Quarterly [Member]	Dec. 31, 2012 Special Dividend [Member]
Payments of Dividends (in Dollars)	$ 877,000	$ 18,700,000	$ 1,800,000
Common Stock, Dividends, Per Share, Cash Paid		$ 0.845	$ 0.08	$ 0.04	$ 0.025	$ 0.025	$ 0.025	$ 0.02	$ 0.02	$ 0.75
Line of Credit Facility, Dividend Restrictions, Percentage of Net Income Limit		25.00%