Note 5 - Fair Value of Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended		0 Months Ended
	Oct. 16, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 06, 2014 NGI Swap Contract [Member] mJ	Oct. 16, 2013 NGI Swap Contract [Member] mJ bbl	Sep. 03, 2013 NGI Swap Contract [Member] mJ	Oct. 16, 2013 New York Harbor ULSD Swap Contract [Member] MWh
Note 5 - Fair Value of Financial Instruments (Details) [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure (in Millijoules)				2,200,000	4,200,000	4,400,000
Underlying, Derivative Energy Measure	125.150			4.95	4.103	4.035
Derivative, Nonmonetary Notional Amount, Volume (in Barrels (of Oil))					275,000
Fluctuation in Energy Rate (in Megawatt-hours)							25
Gain (Loss) on Price Risk Derivative Instruments Not Designated as Hedging Instruments (in Dollars)		$ 2.4	$ 4.6