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Earnings Per Share - Earnings Per Share (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]                    
Net income $ 545,000 $ 1,473,000 $ 3,267,000 $ 565,000 $ 440,000 $ 1,208,000 $ 2,710,000 $ 436,000 $ 5,850,998 $ 4,793,525
Weighted average shares outstanding                 3,327,867 3,334,790
Effect of dilutive employee stock options                 249,956 352,546
Denominator for dilutive earnings per share                 3,577,823 3,687,336
Basic earnings per share $ .16 $ .44 $ .98 $ .17 $ .12 $ .36 $ .82 $ .13 $ 1.76 $ 1.44
Dilutive earnings per share $ .15 $ .40 $ .91 $ .16 $ .11 $ .33 $ .74 $ .12 $ 1.64 $ 1.30