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Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Accounts receivable, allowance for doubtful accounts $ 16,943 $ 16,943
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, shares issued (in shares) 4,594,319 4,594,319
Common stock, shares outstanding (in shares) 4,594,319 4,594,319
Common stock, shares authorized (in shares) 10,000,000 10,000,000