NET INCOME (LOSS) PER COMMON SHARE (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share

	Year ended December 31,
	2020		2019		2018
	(thousands of dollars, except per share amounts)
Net Income per Common Share - Continuing Operations
Net income (loss) from continuing operations	$	4,966	$	(12,884)	$	(1,728)
Basic income (loss) from continuing operations per common share:
Weighted average shares outstanding	24,802		24,698		24,438
Per share amount (dollars)	$	0.20	$	(0.52)	$	(0.07)
Diluted income (loss) from continuing operations per common share:
Weighted average shares outstanding	25,356		24,698		24,438
Per share amount (dollars)	$	0.20	$	(0.52)	$	(0.07)
Weighted average shares-denominator   basic computation	24,802		24,698		24,438
Unvested restricted stock unit grant	554		—		—
Weighted average shares, as adjusted   denominator diluted computation	25,356		24,698		24,438
Net Income per Common Share - Discontinued Operations
Net income (loss) from discontinued operations	$	26,209	$	(2,090)	$	(604)
Basic income (loss) from discontinued operations per common share:
Weighted average shares outstanding	24,802		24,698		24,438
Per share amount (dollars)	$	1.06	$	(0.08)	$	(0.02)
Diluted income (loss) from discontinued operations per common share:
Weighted average shares outstanding	25,356		24,698		24,438
Per share amount (dollars)	$	1.03	$	(0.08)	$	(0.02)
Weighted average shares-denominator   basic computation	24,802		24,698		24,438
Unvested restricted stock unit grant	554		—		—
Weighted average shares, as adjusted   denominator diluted computation	25,356		24,698		24,438
Net Income per Common Share
Net income (loss)	$	31,175	$	(14,974)	$	(2,332)
Basic income (loss) per common share:
Weighted average shares outstanding	24,802		24,698		24,438
Per share amount (dollars)	$	1.26	$	(0.61)	$	(0.10)
Diluted income (loss) per common share:
Weighted average shares outstanding	25,356		24,698		24,438
Per share amount (dollars)	$	1.23	$	(0.61)	$	(0.10)
Weighted average shares-denominator   basic computation	24,802		24,698		24,438
Unvested restricted stock unit grant	554		—		—
Effect of dilutive stock options	—		—		—
Weighted average shares, as adjusted   denominator diluted computation	25,356		24,698		24,438