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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities    
Net income $ 1,706,000 $ 2,184,000
Adjustments to reconcile net income to net cash provided by (used in) operations    
Depreciation and amortization 119,000 136,000
Deferred income taxes 99,000 (29,000)
Net premium amortized and discount earned on bonds and U.S. Treasury Bills (1,000) (5,000)
Decrease (increase) in current assets    
Accounts receivable, net 85,000 (2,164,000)
Inventories 5,000 (6,000)
Prepaid expenses and other assets (96,000) (50,000)
Increase (decrease) in current liabilities    
Accounts payable 220,000 732,000
Accrued liabilities (1,617,000) (1,552,000)
Income taxes 701,000 1,084,000
Deferred subscription and other revenues (581,000) (440,000)
Net cash provided by (used in) operating activities 640,000 (110,000)
Cash flows from investing activities    
Maturities and sales of U.S. Treasury Bills 12,600,000 13,500,000
Purchases of U.S. Treasury Bills   (13,496,000)
Purchases of marketable securities (13,581,000)  
Purchases of property, plant and equipment (114,000) (26,000)
Net cash used in investing activities (1,095,000) (22,000)
Decrease in cash and cash equivalents (455,000) (132,000)
Cash and cash equivalents    
Beginning of period 3,058,000 3,615,000
End of period $ 2,603,000 $ 3,483,000