Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income (loss)	$ 6,439	$ (222)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	1,888	2,155
Non-cash gain of acquisition-related contingent consideration	0	(16)
Deferred income taxes	0	168
Loss (gain) on asset dispositions	(8,717)	72
Stock-based compensation	57	59
Net changes in operating assets and liabilities:
Accounts receivable	551	372
Inventory of parts and supplies	(72)	7
Prepaid expenses	566	477
Other assets	3	18
Accounts payable and accrued liabilities	(956)	(611)
Income taxes payable and receivable	2,097	(253)
Operating lease assets and liabilities, net	(243)	(282)
Long-term insurance liabilities and other long-term liabilities	(8)	(5)
Net cash provided by operating activities	1,605	1,939
Cash flows from investing activities:
Purchase of property and equipment	(948)	(308)
Proceeds from the sale of property, plant and equipment	9,840	33
Net cash provided by (used in) investing activities	8,892	(275)
Cash flows from financing activities:
Dividends paid	(12,808)	(10,132)
Proceeds from exercised stock options	112	0
Net cash used in financing activities	(12,696)	(10,132)
Net decrease in cash and cash equivalents	(2,199)	(8,468)
Cash and cash equivalents at beginning of period	10,899	15,962
Cash and cash equivalents at end of the period	8,700	7,494
Supplemental disclosures of cash flow information:
Interest	4	7
Income taxes	2	0
Right-of-use assets obtained in exchange for operating lease liabilities	$ 1,453	$ 0