UNAUDITED CONDENSED 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	1,138			1,138
Dividends declared:
Common stock, $0.22/share	(928)			(928)
Ending balance at Mar. 31, 2018	147,329	422	11,693	135,214
Beginning balance at Dec. 31, 2017	147,119	422	11,693	135,004
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	4,758
Ending balance at Jun. 30, 2018	150,024	422	11,696	137,906
Beginning balance at Mar. 31, 2018	147,329	422	11,693	135,214
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	3,620			3,620
Stock-based compensation expense	3		3
Dividends declared:
Common stock, $0.22/share	(928)			(928)
Ending balance at Jun. 30, 2018	150,024	422	11,696	137,906
Beginning balance at Dec. 31, 2018	146,598	422	11,948	134,228
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	4,908			4,908
Stock-based compensation expense	123		123
Dividends declared:
Common stock, $0.22/share	(928)			(928)
Awards under LTIP, $0.22/share	(2)			(2)
Ending balance at Mar. 31, 2019	150,699	422	12,071	138,206
Beginning balance at Dec. 31, 2018	146,598	422	11,948	134,228
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	4,914
Ending balance at Jun. 30, 2019	150,108	423	12,497	137,188
Beginning balance at Mar. 31, 2019	150,699	422	12,071	138,206
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	6			6
Stock-based compensation expense	74		74
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, $0.22/share	(1,016)			(1,016)
Awards under LTIP, $0.22/share	(8)			(8)
Ending balance at Jun. 30, 2019	$ 150,108	$ 423	$ 12,497	$ 137,188