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Condensed Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operations:    
Net income $ 7,773,000 $ 6,110,000
Adjustments to reconcile net income to cash provided by (used in) operating activities:    
Purchases of marketable securities (112,663,000) (140,032,000)
Proceeds from sale and maturity of marketable securities 113,767,000 139,275,000
Change in fair value of marketable securities (202,000) 639,000
Deferred income taxes (156,000) (967,000)
Depreciation and amortization 783,000 648,000
Provision for doubtful accounts 50,000  
Stock-based compensation 35,000 36,000
Changes in assets and liabilities:    
Accounts receivable (1,469,000) (646,000)
Costs and estimated earnings in excess of billings (2,113,000) (4,160,000)
Inventories (1,925,000) 1,611,000
Prepaid expenses and other current assets 978,000 877,000
Accounts payable 317,000 2,384,000
Customer deposits (543,000) (3,441,000)
Accrued expenses 202,000 (15,000)
Total adjustments (2,939,000) (3,791,000)
Cash flows provided by operating activities 4,834,000 2,319,000
Cash flows used in investing activities:    
Capital expenditures (1,260,000) (2,709,000)
Cash flows used in investing activities (1,260,000) (2,709,000)
Cash flows from financing activities:    
Proceeds from stock option exercises   340,000
Cash flows provided by financing activities   340,000
Net increase (decrease) in cash and cash equivalents 3,574,000 (50,000)
Cash and cash equivalents at:    
Beginning of period 8,012,000 22,933,000
End of period $ 11,586,000 $ 22,883,000