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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operations:    
Net income $ 4,809,000 $ 3,205,000
Adjustments to reconcile net income to cash provided by operating activities:    
Purchases of marketable securities (306,744,000) (141,432,000)
Proceeds from sale and maturity of marketable securities 306,339,000 140,636,000
Change in fair value of marketable securities (861,000) 105,000
Deferred income taxes 108,000 538,000
Depreciation and amortization 605,000 720,000
Loss on disposal of property and equipment   (10,000)
Provision for doubtful accounts 50,000 30,000
Stock-based compensation 36,000 16,000
Changes in assets and liabilities:    
Accounts receivable (632,000) (666,000)
Costs and estimated earnings in excess of billings 3,241,000 7,000
Inventories (2,964,000) (1,075,000)
Prepaid expenses and other current assets 309,000 263,000
Accounts payable 1,698,000 891,000
Customer deposits 2,795,000 2,356,000
Accrued expenses 350,000 391,000
Total adjustments 4,330,000 2,770,000
Cash flows provided by operating activities 9,139,000 5,975,000
Cash flows used in investing activities:    
Capital expenditures (420,000) (85,000)
Cash flows used in investing activities (420,000) (85,000)
Cash flows from financing activities:    
Proceeds from stock option exercises 98,000 101,000
Cash flows provided by financing activities 98,000 101,000
Net increase in cash 8,817,000 5,991,000
Cash and cash equivalents at:    
Beginning of period 18,219,000 11,152,000
End of period $ 27,036,000 $ 17,143,000