Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income (loss)	$ (274,000)	$ 1,551,000
Adjustments to reconcile net income (loss) to cash (used in) provided by operating activities:
Purchase of marketable securities	(35,718,000)	(33,191,000)
Proceeds from sale and maturity of marketable securities	35,326,000	32,680,000
Change in value of marketable securities	(314,000)	(2,040,000)
Deferred and other income taxes	13,000	382,000
Depreciation and amortization	750,000	586,000
Provision for doubtful accounts	75,000	0
Changes in assets and liabilities:
Accounts receivable	(829,000)	(772,000)
Costs and estimated earnings in excess of billings	678,000	1,696,000
Inventories (excluding the effect of the Blaw-Knox acquisition)	(3,846,000)	2,617,000
Prepaid expenses and other current assets	(1,170,000)	75,000
Accounts payable	1,350,000	1,496,000
Customer deposits	3,453,000	(1,156,000)
Accrued expenses and other	(475,000)	(219,000)
Total adjustments	(707,000)	2,154,000
Cash flows (used in) provided by operating activities	(981,000)	3,705,000
Cash flows from investing activities:
Acquisition of Blaw-Knox assets	0	(14,400,000)
Capital expenditures (excluding assets acquired in the Blaw-Knox acquisition)	(1,003,000)	(932,000)
Cash flows used in investing activities	(1,003,000)	(15,332,000)
Net decrease in cash and cash equivalents	(1,984,000)	(11,627,000)
Cash and cash equivalents at:
Beginning of period	23,232,000	35,584,000
End of period	21,248,000	23,957,000
Non-cash investing and financing activities:
Operating lease right-of-use assets	39,000	254,000
Operating lease liabilities	$ 39,000	$ 254,000