Note 6 - Stock-based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified						9 Months Ended				9 Months Ended										1 Months Ended	9 Months Ended		12 Months Ended	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2014 Director [Member] Common Class A [Member] Restricted Stock [Member] January 01, 2015 [Member]	Sep. 30, 2013 Director [Member] Restricted Stock [Member]	Sep. 30, 2014 Common Class A [Member] Restricted Stock [Member] January 17, 2015 [Member] Employee [Member]	Sep. 30, 2014 Common Class A [Member] Restricted Stock [Member] January 17, 2017 [Member] Employee [Member]	Sep. 30, 2014 Common Class A [Member] Restricted Stock [Member] January 17, 2016 [Member] Employee [Member]	Sep. 30, 2014 Common Class A [Member] Restricted Stock [Member] Employee [Member]	Sep. 30, 2014 Common Class A [Member] Restricted Stock [Member] Director [Member]	Sep. 30, 2014 Common Class A [Member] Restricted Stock [Member]	Sep. 30, 2013 Common Class A [Member] Restricted Stock [Member]	Sep. 30, 2014 Common Class A [Member]	Sep. 30, 2014 Restricted Stock [Member] January 17, 2015 [Member] Employee [Member]	Sep. 30, 2014 Restricted Stock [Member] January 17, 2017 [Member] Employee [Member]	Sep. 30, 2014 Restricted Stock [Member] January 17, 2016 [Member] Employee [Member]	Sep. 30, 2014 Restricted Stock [Member] March 19, 2016 [Member] Employee [Member]	Sep. 30, 2014 Restricted Stock [Member] March 19, 2015 [Member] Employee [Member]	Mar. 19, 2014 Restricted Stock [Member] Employee [Member]	Sep. 30, 2014 Restricted Stock [Member] Employee [Member]	Sep. 30, 2013 Restricted Stock [Member] Employee [Member]	Dec. 31, 2013 Restricted Stock [Member] Employee [Member]	Sep. 30, 2014 Restricted Stock [Member]	Sep. 30, 2013 Restricted Stock [Member]
Note 6 - Stock-based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period						63,210				194,413	41,881	236,294	0								312,961	318,852		312,961	382,062
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period										31,821		31,821	0							70,542	68,991		107,224	202,743	107,224
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number					41,881		75,412	43,590	43,590						127,316	58,327	58,327	70,542	70,542
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	274,746	274,746	274,746	1,316,068										0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value (in Dollars)	$ 1.6