Note 10 - Stock Based Compensation (Detail) (USD $)	12 Months Ended				12 Months Ended						12 Months Ended		12 Months Ended			3 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Jul. 31, 2012	Dec. 31, 2010	Dec. 31, 2012 Non-Employee Directors [Member] Nineteen Ninety Nine Director Stock Options [Member]	Dec. 31, 2012 Restricted Stock [Member] Minimum [Member]	Dec. 31, 2012 Restricted Stock [Member] Maximum [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2010 Nineteen Ninety Eight Directors Stock Plan [Member]	Dec. 31, 2012 Nineteen Ninety Nine Director Stock Options [Member] Minimum [Member]	Dec. 31, 2010 Nineteen Ninety Nine Director Stock Options [Member]	Dec. 31, 2012 Director Stock Option Plan - 1999 (Member)	Dec. 31, 2010 Nineteen Ninety Nine Stock Incentive Plan [Member]	May 17, 2009 Nineteen Ninety Nine Stock Incentive Plan [Member]	Apr. 12, 2010 Two Thousand Nine Plan [Member]	Dec. 31, 2012 Two Thousand Nine Plan [Member]	Dec. 31, 2010 Two Thousand Nine Plan [Member]	May 19, 2010 Two Thousand Nine Plan [Member]	Dec. 31, 2012 Plan 2009 (Member)
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)			25,000							600,000		1,975,000			3,200,000			1,000,000	4,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	1,551,000	370,000			2,049,798									2,892,500						1,148,748
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	(337,516)	(123,837)											727,782							230,420
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period						1 year	3 years				1 year			4 years
Award Term	10 years													10 years
Period from Date of Grant														1 year
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized																2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares)	1,448,016		325,000	1,298,516													1,991,000
Share-based Compensation (in Dollars)	$ 156,000	$ 125,000						$ 222,000	$ 226,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value (in Dollars)	82,270	130,250
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value (in Dollars)	62,410	15,750
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value (in Dollars)	15,600	13,250
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)	$ 391,031							$ 21,186