CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Contributed Capital	Retained Earnings
Beginning balance at Dec. 31, 2017	$ 147,119	$ 422	$ 11,693	$ 135,004
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	2,945			2,945
Stock-based compensation expense	255		255
Dividends declared:
Common stock	(3,711)			(3,711)
Awards under LTIP	(10)			(10)
Ending balance at Dec. 31, 2018	146,598	422	11,948	134,228
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	8,207			8,207
Stock-based compensation expense	478		478
Issuance of common shares for acquisition	392	1	391
Cancellation of shares withheld to cover taxes upon vesting of restricted awards	(39)		(39)
Dividends declared:
Common stock	(3,976)			(3,976)
Awards under LTIP	(19)			(19)
Ending balance at Dec. 31, 2019	151,641	423	12,778	138,440
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	995			995
Stock-based compensation expense	643		643
Cancellation of shares withheld to cover taxes upon vesting of restricted awards	(81)		(81)
Dividends declared:
Common stock	(4,070)			(4,070)
Awards under LTIP	(36)			(36)
Ending balance at Dec. 31, 2020	$ 149,092	$ 423	$ 13,340	$ 135,329