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Net Income per Common Share (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Net income $ 1,688,000 $ 2,890,000
Weighted average common shares outstanding — basic 7,652,000 7,597,000
Weighted Average Number Diluted Shares Outstanding Adjustment 56,000 10,000
Weighted average common and potentially issuable common shares outstanding — diluted 7,708,000 7,607,000
Basic net income per common share (USD per share) $ 0.22 $ 0.38
Diluted net income per common share (USD per share) $ 0.22 $ 0.38