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Consolidated Balance Sheets (Parentheticals) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Accounts receivable-trade, net allowance for doubtful accounts $ 2,404 $ 1,746
Preferred stock, par value (in dollars per share) $ 0.10 $ 0.10
Preferred stock, shares authorized (in shares) 20,000,000 20,000,000
Preferred stock, issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.0024 $ 0.0024
Common stock, shares authorized (in shares) 25,000,000 25,000,000
Common stock, shares issued (in shares) 11,309,326 11,275,641
Common stock, shares outstanding (in shares) 9,266,496 9,753,293
Treasury stock, shares (in shares) 2,042,830 1,522,348