Note 10 - Share-Based Compensation (Detail) (USD $)	0 Months Ended	3 Months Ended		12 Months Ended
	Mar. 15, 2013	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares)		0	0
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options				$ 100,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition		2 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value			500,000	400,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized		1,000,000
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in Shares)		86,500
Share-based Compensation	$ 400,000	$ 133,000	$ 176,000
Stock Repurchased During Period, Shares (in Shares)	30,100
Restricted Stock [Member]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition		219 days