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Consolidated Balance Sheets (Parentheticals) (USD $)
Sep. 30, 2014
Sep. 30, 2013
Marketable securities, common stocks $ 165,734,000us-gaap_TradingSecurities $ 129,699,000us-gaap_TradingSecurities
Marketable securities, bonds 7,942,000us-gaap_TradingSecuritiesDebt 7,295,000us-gaap_TradingSecuritiesDebt
Accounts receivable, allowance for doubtful accounts $ 250,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 250,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred stock, par value (in dollars per share) $ 0us-gaap_PreferredStockParOrStatedValuePerShare $ 0us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized (in shares) 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued (in shares) 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common stock, par value (in dollars per share) $ 0us-gaap_CommonStockParOrStatedValuePerShare $ 0us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized (in shares) 5,000,000us-gaap_CommonStockSharesAuthorized 5,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares) 1,805,053us-gaap_CommonStockSharesIssued 1,805,053us-gaap_CommonStockSharesIssued