Note 12 - Fair Value Measurements (Detail) - Summary of impairments associated with certain assets measured at fair value on a nonrecurring basis within Level 3, six months ended (USD $)	3 Months Ended				6 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Mar. 31, 2013		Mar. 31, 2012
Producing Properties	$ 9,786	[1]	$ 489,841	[1]	$ 342,006	[1]	$ 908,963	[1]
Producing Properties	$ 63,476	[1]	$ 217,262	[1]	$ 218,441	[1]	$ 580,809	[1]

[1] Summary of impairments associated with certain assets measured at fair value on a nonrecurring basis within Level 3