Note 5 - Fair Value of Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		0 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 06, 2014 NGI Swap Contract [Member] mJ	Oct. 16, 2013 NGI Swap Contract [Member] mJ	Sep. 03, 2013 NGI Swap Contract [Member] mJ	Oct. 16, 2013 New York Harbor ULSD Swap Contract [Member] bbl MWh
Note 5 - Fair Value of Financial Instruments (Details) [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure					2,200,000	4,200,000	4,400,000
Underlying, Derivative Energy Measure					4.95	4.103	4.035	125.150
Derivative, Nonmonetary Notional Amount, Volume								275,000
Fluctuation in Energy Rate								25
Gain (Loss) on Price Risk Derivative Instruments Not Designated as Hedging Instruments	$ 0.3	$ 3.5	$ 2.7	$ 1.1