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(Loss) Earnings per Share (Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								6 Months Ended	9 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	Jun. 30, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Income (Loss) Attributable to Parent [Abstract]
Net (loss) income	$ (1,710)	$ (12,579)	$ 327	$ 98	$ (749)	$ (118)	$ 211	$ 190			$ (13,864)	$ (466)	$ 19,794
Denominator for basic net income per common share:
Weighted average common shares outstanding, Basic (in shares)											13,114,000	12,965,000	12,831,000
Denominator for diluted net income per share:
Dilutive effect of stock options and restricted shares (in shares)											0	0	279,000
Weighted average common shares outstanding, Diluted (in shares)											13,114,000	12,965,000	13,110,000
Earnings Per Share, Basic and Diluted [Abstract]
Earnings (loss) per share - Basic (in dollars per share)	$ (0.13)	$ (0.96)	$ 0.02	$ 0.01	$ (0.06)	$ (0.01)	$ 0.02	$ 0.01	$ 0.03	$ (0.93)	$ (1.06)	$ (0.04)	$ 1.54
Earnings (loss) per share - Diluted (in dollars per share)	$ (0.13)	$ (0.96)	$ 0.02	$ 0.01	$ (0.06)	$ (0.01)	$ 0.02	$ 0.01	$ 0.03	$ (0.93)	$ (1.06)	$ (0.04)	$ 1.51
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)											0	0
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)													83,917
Range of exercise prices, lower limit (in dollars per share)													$ 28.15
Range of exercise prices, upper limit (in dollars per share)													$ 33.36

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