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Net Income per Common Share (Details) - USD ($)	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income (loss)	$ (5,462,000)	$ (6,125,000)	$ 209,000	$ (3,845,000)	$ (3,942,000)	$ (1,803,000)	$ 445,000	$ 518,000	$ 754,000	$ 855,000	$ 2,162,000	$ 1,688,000	$ (15,223,000)	$ (4,782,000)	$ 5,459,000
Weighted average common shares outstanding — basic													7,830,000	7,750,000	7,690,000
Effect of dilutive securities (in shares)													0	0	57,000
Weighted average common and potentially issuable common shares outstanding — diluted (in shares)													7,830,000	7,750,000	7,747,000
Basic net income per common share (USD per share)	$ (0.69)	$ (0.78)	$ 0.03	$ (0.49)	$ (0.51)	$ (0.23)	$ 0.06	$ 0.07	$ 0.10	$ 0.11	$ 0.28	$ 0.22	$ (1.94)	$ (0.62)	$ 0.71
Diluted net income per common share (USD per share)	$ (0.69)	$ (0.78)	$ 0.03	$ (0.49)	$ (0.51)	$ (0.23)	$ 0.06	$ 0.07	$ 0.10	$ 0.11	$ 0.28	$ 0.22	$ (1.94)	$ (0.62)	$ 0.70

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