Operating Segments (Details) - USD ($)	3 Months Ended								12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, 5 Percent Threshold, Amount									$ 0.05
Operating Revenues [Abstract]
Total operating revenues	$ 10,860,988	$ 26,202,462	$ 16,673,347	$ 10,393,423	$ 11,906,360	$ 35,085,307	$ 25,875,266	$ 13,321,305	64,130,220	$ 86,188,238	$ 95,845,871
Operating Expenses [Abstract]
Total operating expenses									52,696,228	73,224,377	80,242,432
Other Income and Deductions, Net [Abstract]
Total other income and deductions									4,124	25,097	201,462
Interest Charges [Abstract]
Total interest charges									2,531,257	2,600,662	2,671,187
Income Tax Expense [Abstract]
Total income tax expense									3,377,481	3,892,215	4,858,586
Net Income [Abstract]
Net income (Loss)	267,043	$ 3,983,441	$ 1,803,351	$ (524,457)	(4,464)	$ 4,155,136	$ 2,656,534	$ (311,125)	5,529,378	6,496,081	8,275,128
Assets [Abstract]
Total assets	188,879,129				187,711,166				188,879,129	187,711,166	185,935,000
Capital Expenditures [Abstract]
Total capital expenditures									6,303,000	9,011,000	8,078,000
Largest Customer [Member]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, 5 Percent Threshold, Amount									11,555,000	17,852,000	12,569,000
Second Largest Customer [Member]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, 5 Percent Threshold, Amount									5,656,000	7,127,000	9,494,000
Intersegment Eliminations [Member]
Operating Expenses [Abstract]
Total segment operating expenses									$ (3,591,000)	$ (3,869,000)	$ (4,041,000)
Regulated Operation [Member]
Segment Reporting Information [Line Items]
Percentage of natural gas purchased from two suppliers (in hundredths)									99.00%	99.00%	98.00%
Operating Revenues [Abstract]
Regulated Operating Revenue									$ 41,242,094	$ 52,681,120	$ 57,054,180
Operating Expenses [Abstract]
Purchased gas									11,704,178	22,728,766	27,215,425
Depreciation									6,328,000	6,293,000	6,068,000
Other									16,033,000	15,819,000	15,285,000
Other Income and Deductions, Net [Abstract]
Total other income and deductions									4,000	25,000	183,000
Interest Charges [Abstract]
Total interest charges									2,486,000	2,551,000	2,633,000
Income Tax Expense [Abstract]
Total income tax expense									3,238,000	3,553,000	3,907,000
Net Income [Abstract]
Net income (Loss)									4,982,000	5,748,000	6,407,000
Assets [Abstract]
Total assets	185,634,000				183,482,000				185,634,000	183,482,000	181,440,000
Capital Expenditures [Abstract]
Total capital expenditures									6,293,000	8,991,000	8,078,000
Regulated Operation [Member] | Intersegment Eliminations [Member]
Operating Revenues [Abstract]
Intersegment revenues									3,591,000	3,869,000	4,041,000
Regulated Operation [Member] | Operating Segments [Member]
Operating Revenues [Abstract]
Regulated Operating Revenue									44,833,000	56,550,000	61,095,000
Operating Expenses [Abstract]
Total operating expenses									$ 34,065,000	$ 44,841,000	$ 48,568,000
Unregulated Operation [Member]
Segment Reporting Information [Line Items]
Percentage of natural gas purchased from two suppliers (in hundredths)									99.00%	99.00%	96.00%
Operating Revenues [Abstract]
Unregulated Operating Revenue									$ 22,888,126	$ 33,507,118	$ 38,791,691
Operating Expenses [Abstract]
Non-regulated purchase gas									17,621,069	26,713,424	29,059,426
Depreciation									88,000	84,000	80,000
Other									4,513,000	5,455,000	6,576,000
Total segment operating expenses									22,222,000	32,252,000	35,715,000
Other Income and Deductions, Net [Abstract]
Total other income and deductions									0	0	18,000
Interest Charges [Abstract]
Total interest charges									45,000	50,000	38,000
Income Tax Expense [Abstract]
Total income tax expense									139,000	339,000	952,000
Net Income [Abstract]
Net income (Loss)									547,000	748,000	1,868,000
Assets [Abstract]
Total assets	$ 3,245,000				$ 4,229,000				3,245,000	4,229,000	4,495,000
Capital Expenditures [Abstract]
Total capital expenditures									10,000	20,000	0
Unregulated Operation [Member] | Intersegment Eliminations [Member]
Operating Revenues [Abstract]
Intersegment revenues									(3,591,000)	(3,869,000)	(4,041,000)
Retained Earnings [Member]
Net Income [Abstract]
Net income (Loss)									$ 5,529,378	$ 6,496,081	$ 8,275,128