Note 10 - Stock Based Compensation (Detail) (USD $)	1 Months Ended	12 Months Ended									12 Months Ended				24 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2012 2001 Stock Option Plan [Member]	Dec. 31, 2001 2001 Stock Option Plan [Member]	Dec. 31, 2012 2004 Stock Incentive Plan [Member]	Dec. 31, 2004 2004 Stock Incentive Plan [Member]	Dec. 31, 2007 2007 Stock Incentive Plan [Member] Greater than 10% Ownership [Member]	Dec. 31, 2012 2007 Stock Incentive Plan [Member]	Dec. 31, 2011 2007 Stock Incentive Plan [Member]	Dec. 31, 2010 2007 Stock Incentive Plan [Member]	Dec. 31, 2007 2007 Stock Incentive Plan [Member]	Dec. 31, 2013 2007 Stock Incentive Plan [Member]	Jun. 13, 2007 2007 Stock Incentive Plan [Member]	Dec. 31, 2012 Issued to Consultants for Services [Member]	Dec. 31, 2011 Issued to Consultants for Services [Member]	Dec. 31, 2010 Issued to Consultants for Services [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			6 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Term			10 years															10 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	2,250,000	2,250,000					666,667		666,667							1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant						616,667		515,871			2,153,974
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized		4,250,000												2,000,000
Percentage of Fair Market Value of Shares										110.00%				100.00%
Percentage of Outstanding Stock, Determining Factor for Incentive Stock Price														10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		668,494										246,667					21,241	5,000	22,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period		289,424	250,169	130,833							297,091	256,002
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		214,091
Proceeds from Stock Options Exercised (in Dollars)		$ 697,220
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	3,264,880	3,264,880	3,113,144	2,167,646	1,641,979						3,284,214
Allocated Share-based Compensation Expense (in Dollars)	1,143,764	1,100,000	1,207,886	1,653,060								1,200,000	1,700,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)											$ 1,400,000
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, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)											$ 1.57	$ 1.81