Note 8 - Stock-Based Compensation (Details) - Phantom Stock Plan (Phantom Share Units (PSUs) [Member], USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Phantom Share Units (PSUs) [Member]
Note 8 - Stock-Based Compensation (Details) - Phantom Stock Plan [Line Items]
Granted	9,142
Granted	$ 19.82
Forfeited	(55)
Forfeited	$ 19.74
Distributions	(1,736)
Distributions	$ 19.64
Shares	66,674	59,323
Fair Value	$ 18.27	$ 20.70
Vested at September 30, 2014	66,557
Vested at September 30, 2014	$ 18.27