Note 8 - Stock-Based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended						3 Months Ended	6 Months Ended							3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Restricted Stock Units (RSUs) [Member] 2014 Omnibus Incentive Plan [Member]	Jun. 30, 2013 Restricted Stock Units (RSUs) [Member] 2014 Omnibus Incentive Plan [Member]	Jun. 30, 2014 Restricted Stock Units (RSUs) [Member] 2014 Omnibus Incentive Plan [Member]	Jun. 30, 2013 Restricted Stock Units (RSUs) [Member] 2014 Omnibus Incentive Plan [Member]	Jun. 30, 2014 Restricted Stock Units (RSUs) [Member]	Jun. 30, 2013 Restricted Stock Units (RSUs) [Member]	Jun. 30, 2014 Phantom Share Units (PSUs) [Member] Prior to January 1, 2009 [Member] Officer [Member] Phantom Stock Plan [Member]	Jun. 30, 2014 Phantom Share Units (PSUs) [Member] Officer [Member] Phantom Stock Plan [Member]	Mar. 31, 2013 Phantom Share Units (PSUs) [Member] Phantom Stock Plan [Member]	Jun. 30, 2014 Phantom Share Units (PSUs) [Member] Phantom Stock Plan [Member]	Jun. 30, 2014 Phantom Share Units (PSUs) [Member]	Jun. 30, 2014 Annually [Member] Officer [Member] Phantom Stock Plan [Member]	Jun. 30, 2014 Change of Control [Member] Officer [Member] Phantom Stock Plan [Member]	Jun. 30, 2014 Officer [Member] Phantom Stock Plan [Member]	Jun. 30, 2014 2014 Omnibus Incentive Plan [Member]	May 20, 2014 2014 Omnibus Incentive Plan [Member]	Jun. 30, 2014 Phantom Stock Plan [Member]	Jun. 30, 2013 Phantom Stock Plan [Member]	Jun. 30, 2014 Phantom Stock Plan [Member]	Jun. 30, 2013 Phantom Stock Plan [Member]	Jun. 30, 2014 Minimum [Member] 2014 Omnibus Incentive Plan [Member]
Note 8 - Stock-Based Compensation (Details) [Line Items]
Allocated Share-based Compensation Expense	$ 600,000	$ 400,000	$ 3,100,000	$ 2,400,000																	$ (25,000)	$ (21,000)	$ 17,000	$ 78,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	200,000	200,000	1,200,000	900,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted (in Shares)									264,095	243,645					8,609
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)	0	0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)																				1,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)																			1,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																		5 years							3 years
Share-based Compensation Arrangement by Share-based Payment Award, Contractual Term																			10 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized					5,400,000		5,400,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition							3 years 146 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value					0	200,000	4,100,000	2,800,000															13,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period											1 year	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage																20.00%	100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid													$ 8,000	$ 7,000										$ 8,000