Restatement - Cash flow restatement lines (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 1,361	$ 1,704	$ 4,155	$ 4,044
Adjustments to reconcile net income to net cash provided by operating activities:
Income from discontinued operations, net	(516)	(787)	(2,179)	(1,961)
Depreciation, depletion and amortization			3,851	3,384
Deferred income taxes			1,583	372
Equity in loss of joint ventures	150	31	180	63	$ 128
Loss (Gain) on sale of equipment and property			120	(74)
Stock-based compensation	$ 582	791	754	960
Net changes in operating assets and liabilities:
Accounts receivable			146	1,516
Deferred costs and other assets			(180)	(102)
Accounts payable and accrued liabilities			(2,828)	(2,139)
Income taxes payable and receivable			(2,348)	(1,379)
Other long-term liabilities			33	50
Net cash provided by operating activities of continuing operations			3,287	4,734
Net cash provided by operating activities of discontinued operations			4,984	4,050
Net cash provided by operating activities			$ 8,271	8,784
Restatement Adjustment [Member]
Cash flows from operating activities:
Net income		1,704		4,044
Adjustments to reconcile net income to net cash provided by operating activities:
Income from discontinued operations, net		(787)		(1,961)
Depreciation, depletion and amortization				3,384
Deferred income taxes				372
Equity in loss of joint ventures		31		63
Loss (Gain) on sale of equipment and property				(74)
Stock-based compensation				960
Net changes in operating assets and liabilities:
Accounts receivable				1,516
Deferred costs and other assets				(102)
Accounts payable and accrued liabilities				(2,139)
Income taxes payable and receivable				(1,379)
Other long-term liabilities				50
Net cash provided by operating activities of continuing operations				4,734
Net cash provided by operating activities of discontinued operations				4,050
Net cash provided by operating activities				8,784
Previously Reported [Member]
Cash flows from operating activities:
Net income		1,704		4,044
Adjustments to reconcile net income to net cash provided by operating activities:
Income from discontinued operations, net		(392)		(1,566)
Depreciation, depletion and amortization				3,384
Deferred income taxes				372
Equity in loss of joint ventures		$ 31		63
Loss (Gain) on sale of equipment and property				(74)
Stock-based compensation				960
Net changes in operating assets and liabilities:
Accounts receivable				1,516
Deferred costs and other assets				(102)
Accounts payable and accrued liabilities				(2,139)
Income taxes payable and receivable				(1,379)
Other long-term liabilities				50
Net cash provided by operating activities of continuing operations				5,129
Net cash provided by operating activities of discontinued operations				3,655
Net cash provided by operating activities				$ 8,784