Note 7 - Stock-based Compensation (Detail) - Summary of restricted shares (USD $)	12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 2007 Incentive Plan [Member]	Dec. 31, 2010 2007 Incentive Plan [Member]	Dec. 31, 2009 2007 Incentive Plan [Member]	Dec. 31, 2012 Directors Restricted Stock Plan [Member]	Dec. 31, 2011 Directors Restricted Stock Plan [Member]	Dec. 31, 2010 Directors Restricted Stock Plan [Member]
Number of Shares, Beginning of Period		0	0	0	10,000	33,000	66,000
Weighted- Average Grant Date Fair Value Per Share, Beginning of Period (in Dollars per share)		$ 0	$ 0	$ 0	$ 4.94	$ 5.74	$ 6.36
Number of Shares	432,396	432,396			0	0	0
Weighted- Average Grant Date Fair Value Per Share (in Dollars per share)		$ 1.65			$ 0	$ 0	$ 0
Number of Shares		(432,396)			(10,000)	(23,000)	(33,000)
Weighted- Average Grant Date Fair Value Per Share (in Dollars per share)		$ 1.65			$ 4.94	$ 6.08	$ 6.97
Number of Shares, End of Period		0	0	0		10,000	33,000
Weighted- Average Grant Date Fair Value Per Share, End of Period (in Dollars per share)		$ 0	$ 0	$ 0		$ 4.94	$ 5.74