Note 10 - Equity Incentive Plan (Details) (USD $)	12 Months Ended											12 Months Ended		1 Months Ended	0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Stock Options, SAR’s and Restricted Stock Awards [Member]	Dec. 31, 2012 Stock Options, SAR’s and Restricted Stock Awards [Member]	Dec. 31, 2011 Stock Options, SAR’s and Restricted Stock Awards [Member]	Dec. 31, 2013 Stock Options and SARs [Member]	Dec. 31, 2013 Incentive Stock Options [Member]	Dec. 31, 2013 Nonqualified Stock Options [Member]	Dec. 31, 2013 Stock Appreciation Rights (SARs) [Member]	Jun. 04, 2003 2003 Plan [Member]	Dec. 31, 2013 2003 Plan [Member] Minimum [Member]	Dec. 31, 2013 2003 Plan [Member] Maximum [Member]	Jun. 18, 2013 Amended 2003 Plan [Member]	Jun. 05, 2009 Amended 2003 Plan [Member]	Jun. 07, 2011 Second Amended 2003 Plan [Member]	Dec. 31, 2013 1993 Plan [Member]
Note 10 - Equity Incentive Plan (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)											1,500,000			3,800,000	2,350,000	3,150,000	1,266,036
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in Shares)														650,000	850,000	800,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period												1 year	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares)	0																1,513,326
Volatility Assumptions, Average Stock Price Term	4 years
Allocated Share-based Compensation Expense				$ 1,268,070	$ 1,151,199	$ 1,190,697
Share Based Compensation Arrangement by Share Based Payment Award, Options and Stock Appreciation Rights Vested and Expected to Vest, Outstanding, Number (in Shares)	1,484,786
Share Based Compensation Arrangement by Share Based Payment Award, Options and Stock Appreciation Rights Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price (in Dollars per share)	$ 7.87
Share Based Compensation Arrangement by Share Based Payment Award,Options and Stock Appreciation Rights, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	28,000,000
Share Based Compensation Arrangement by Share Based Payment Award, Options and Stock Appreciation Rights, Vested and Expected to Vest, Weighted Average Remaining Contractual Term	4 years 36 days
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized							1,974,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition							2 years 328 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in Shares)								198,989	152,968	572,453
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in Dollars per share)								$ 8.56	$ 8.43	$ 7.49
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term								5 years 73 days	5 years 73 days	3 years 146 days
Share Based Compensation Arrangement by Share Based Payment Award, Options and Stock Appreciation Rights, Vested, Aggregate Intrinsic Value	27,997,198	2,115,267
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndStockAppreciationRightsOutstandingIntrinsicValue	43,199,713	4,074,471
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndStockAppreciationRightsExercisesInPeriodTotalIntrinsicValue	4,370,830	2,214,516
Share Based Compensation Arrangement by Share Based Payment Award, Options and Stock Appreciation Rights, Vested in Period, Fair Value	1,088,802	997,194
Proceeds from Stock Options Exercised	3,053,941	388,675	160,470
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	$ 290,704