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Consolidated Statements of Cash Flows (USD $)
 9 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Cash flows from operating activities    
Net income $ 5,917,000 $ 5,660,000
Adjustments to reconcile net income to net cash provided by operations    
Depreciation and amortization 408,000 458,000
Deferred income taxes 29,000 (264,000)
Net premium amortized and discount earned on U.S. Treasury Notes and Bills and bonds (12,000) (6,000)
(Increase) decrease in current assets    
Accounts receivable, net 1,337,000 891,000
Inventories (11,000) (19,000)
Prepaid expenses and other assets 1,000 16,000
Increase (decrease) in current liabilities    
Accounts payable 80,000 9,000
Accrued liabilities (560,000) 646,000
Income taxes 123,000 (72,000)
Deferred subscription and other revenues (12,000) (148,000)
Net cash provided by operating activities 7,300,000 7,171,000
Cash flows from investing activities    
Maturities and sales of U.S. Treasury Bills 42,099,000 27,740,000
Purchases of U.S. Treasury Bills (37,690,000) (31,774,000)
Purchases of marketable securities (11,154,000)  
Purchases of property, plant and equipment (74,000) (87,000)
Net cash used in investing activities (6,819,000) (4,121,000)
Increase in cash and cash equivalents 481,000 3,050,000
Cash and cash equivalents    
Beginning of period 3,615,000 1,425,000
End of period $ 4,096,000 $ 4,475,000