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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net income $ 12,564,000 $ 8,418,000
Adjustments to reconcile net income to cash provided by (used in) operating activities:    
Purchase of marketable securities (256,124,000) (492,674,000)
Proceeds from sale and maturity of marketable securities 239,462,000 491,852,000
Change in value of marketable securities 490,000 (1,126,000)
Deferred and other income taxes 757,000 1,285,000
Depreciation and amortization 1,380,000 1,128,000
Provision for doubtful accounts 210,000 115,000
Loss on disposal of assets 3,000 7,000
Stock-based compensation 71,000 71,000
Changes in assets and liabilities:    
Accounts receivable (19,000) (189,000)
Costs and estimated earnings in excess of billings (5,132,000) (1,847,000)
Inventories (1,527,000) (5,053,000)
Prepaid expenses (244,000) (62,000)
Accounts payable 518,000 (123,000)
Customer deposits (4,065,000) 4,144,000
Accrued expenses (341,000) 162,000
Total adjustments (9,561,000) (2,310,000)
Cash flows provided by (used in) operating activities (11,997,000) 6,108,000
Cash flows from investing activities:    
Capital expenditures (3,550,000) (1,624,000)
Proceeds from sale of property and equipment   7,000
Cash flows used in investing activities (3,550,000) (1,617,000)
Cash flows from financing activities:    
Proceeds from stock option exercises 626,000 223,000
Cash flows provided by financing activities 626,000 223,000
Net increase (decrease) in cash and cash equivalents (14,921,000) 4,714,000
Cash and cash equivalents at:    
Beginning of year 22,933,000 18,219,000
End of year $ 8,012,000 $ 22,933,000