CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net income (loss)	$ 667,600	$ (265,700)
Other comprehensive loss:
Unrealized holding loss on cash flow hedging contracts	(75,400)	(99,500)
Difference in estimated hedge gains receivable	126,600	94,100
Reclassification adjustment for gains realized in net income (loss) from cash flow hedges	(66,700)	(58,700)
Total other comprehensive loss	(15,500)	(64,100)
Comprehensive income (loss)	$ 652,100	$ (329,800)