Note 5 - Stock-based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended		3 Months Ended			1 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Mar. 19, 2016 Scenario, Forecast [Member] Executive Officers [Member]	Mar. 19, 2015 Scenario, Forecast [Member] Executive Officers [Member]	Mar. 19, 2014 Scenario, Forecast [Member] Executive Officers [Member]	Jan. 31, 2014 Scenario, Forecast [Member] Non-Employee Directors [Member]	Sep. 30, 2013 Incentive Plan 2007 [Member]	Sep. 30, 2012 Incentive Plan 2007 [Member]	Sep. 30, 2013 Non-Employee Directors [Member]	Sep. 30, 2013 Restricted Stock [Member]	Sep. 30, 2013 Employee Stock Option [Member]
Note 5 - Stock-based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	382,062	432,396					318,852	432,396	63,210
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	107,224	0	70,542	70,542	70,542	63,210	107,224
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross								359,568
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number										107,224	63,616
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost (in Dollars)	$ 1.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value (in Dollars)	$ 1.6