Note 5 - Fair Value of Financial Instruments (Details) $ in Thousands, mJ in Millions					3 Months Ended		9 Months Ended
	May. 14, 2015 mJ $ / mJ	Mar. 06, 2014 mJ $ / mJ	Oct. 16, 2013 mJ MWh $ / mJ $ / bbl bbl	Sep. 03, 2013 mJ $ / mJ	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Note 5 - Fair Value of Financial Instruments (Details) [Line Items]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax (in Dollars)					$ 22	$ (933)	$ 68	$ (933)
Gain (Loss) on Price Risk Derivative Instruments Not Designated as Hedging Instruments (in Dollars)					$ 400	$ (4,000)
NGI Swap Contract [Member]
Note 5 - Fair Value of Financial Instruments (Details) [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure (in Millijoules) | mJ	2.4	2.2	4.2	4.4
Underlying, Derivative Energy Measure | $ / mJ	3.00	4.95	4.103	4.035
New York Harbor ULSD Swap Contract [Member]
Note 5 - Fair Value of Financial Instruments (Details) [Line Items]
Underlying, Derivative Energy Measure | $ / bbl			125.15
Derivative, Nonmonetary Notional Amount, Volume (in Barrels (of Oil)) | bbl			275,000
Fluctuation in Energy Rate (in Megawatt-hours) | MWh			25
Interest Rate Cap [Member]
Note 5 - Fair Value of Financial Instruments (Details) [Line Items]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax (in Dollars)							$ (800)	$ 1,300