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Condensed Consolidated Balance Sheets - Unaudited (Parentheticals) - USD ($)
Sep. 30, 2017
Mar. 31, 2017
Allowance for bad debt and cash discounts $ 21,052 $ 27,276
Common stock, par value (in dollars per share) $ 1 $ 1
Common stock, shares authorized (in shares) 10,000,000 10,000,000
Common stock, shares issued (in shares) 8,185,160 8,185,160
Treasury stock, shares (in shares) 1,175,716 1,175,716