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Net Income per Common Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income	$ (1,803,000)	$ 855,000	$ (839,000)	$ 4,704,000
Weighted average common shares outstanding — basic	7,804,000	7,711,000	7,758,000	7,683,000
Weighted Average Number Diluted Shares Outstanding Adjustment	0	46,000	0	56,000
Weighted average common and potentially issuable common shares outstanding — diluted	7,804,000	7,757,000	7,758,000	7,739,000
Earnings Per Share, Basic	$ (0.23)	$ 0.11	$ (0.11)	$ 0.61
Earnings Per Share, Diluted	$ (0.23)	$ 0.11	$ (0.11)	$ 0.61

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