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Condensed Consolidated Balance Sheets - Unaudited (Parentheticals) - USD ($)
Jun. 30, 2017
Mar. 31, 2017
Allowance for bad debt and cash discounts $ 27,276 $ 27,276
Common stock, par value (in dollars per share) $ 1 $ 1
Common stock, authorized (in shares) 10,000,000 10,000,000
Common stock, issued (in shares) 7,975,160 7,975,160
Treasury stock, shares (in shares) 1,175,716 1,175,716