Note 7 - Stock-based Compensation (Detail) (USD $)	12 Months Ended						12 Months Ended				12 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 2007 Incentive Plan [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2012 Directors Restricted Stock Plan [Member] Common Class B [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]	Dec. 31, 2007 Common Class A [Member] 2007 Incentive Plan [Member]	Dec. 31, 2012 Officer [Member]	Dec. 31, 2007 2007 Incentive Plan [Member]	Dec. 31, 2012 Directors Restricted Stock Plan [Member]	Dec. 31, 2012 General and Administrative Expense [Member]	Dec. 31, 2011 General and Administrative Expense [Member]	Dec. 31, 2010 General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized						1,000,000				1,000,000		6,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)				4,200,000									770,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Compensation (in Dollars)	$ 878,000	$ 136,000	$ 332,000		$ 400,000									$ 900,000	$ 100,000	$ 300,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	432,396			432,396			0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	359,568	0	0								359,568
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)	$ 1.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value (in Dollars)	77,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)	$ 473,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	3 years 109 days