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Consolidated Balance Sheets (Parentheticals) (USD $)
Mar. 31, 2015
Mar. 31, 2014
Allowance for doubtful accounts $ 222,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 150,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred stock, par value (in dollars per share) $ 1us-gaap_PreferredStockParOrStatedValuePerShare $ 1us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, authorized (in shares) 50,000us-gaap_PreferredStockSharesAuthorized 50,000us-gaap_PreferredStockSharesAuthorized
Common stock, par value (in dollars per share) $ 0.25us-gaap_CommonStockParOrStatedValuePerShare $ 0.25us-gaap_CommonStockParOrStatedValuePerShare
Common stock, authorized (in shares) 4,000,000us-gaap_CommonStockSharesAuthorized 4,000,000us-gaap_CommonStockSharesAuthorized
Common stock, issued (in shares) 2,372,527us-gaap_CommonStockSharesIssued 2,355,028us-gaap_CommonStockSharesIssued
Common stock, outstanding (in shares) 2,372,527us-gaap_CommonStockSharesOutstanding 2,355,028us-gaap_CommonStockSharesOutstanding