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Condensed Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net income $ 165,000 $ 3,839,000
Adjustments to reconcile net income to cash provided by operating activities:    
Purchase of marketable securities (68,803,000) (54,048,000)
Proceeds from sale and maturity of marketable securities 68,043,000 53,067,000
Change in value of marketable securities 1,235,000 (3,167,000)
Deferred and other income taxes (456,000) 501,000
Depreciation and amortization 1,299,000 1,210,000
Provision for doubtful accounts 75,000 25,000
Changes in assets and liabilities, excluding the initial effects of business acquisitions:    
Accounts receivable (1,377,000) (1,576,000)
Costs and estimated earnings in excess of billings 274,000 6,405,000
Inventories (5,334,000) (629,000)
Prepaid expenses and other current assets (1,554,000) (15,000)
Accounts payable 2,636,000 969,000
Customer deposits 5,042,000 2,173,000
Accrued expenses (200,000) 529,000
Total adjustments 880,000 5,444,000
Cash flows provided by operating activities 1,045,000 9,283,000
Cash flows from investing activities:    
Acquisition of Blaw-Knox assets   (13,777,000)
Capital expenditures (1,706,000) (1,729,000)
Cash flows used in investing activities (1,706,000) (15,506,000)
Cash flows from financing activities:    
Proceeds from stock option exercises   56,000
Cash flows provided by financing activities   56,000
Net decrease in cash and cash equivalents (661,000) (6,167,000)
Cash and cash equivalents at:    
Beginning of period 23,232,000 35,584,000
End of period $ 22,571,000 29,417,000
Non-cash investing and financing activities:    
Operating lease right-of-use assets   254,000
Operating lease liabilities   $ 254,000