Shareholders' Equity (Details) - USD ($)			3 Months Ended	9 Months Ended
	Oct. 17, 2018	Aug. 01, 2018	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017	Aug. 06, 2015
Class of Stock [Line Items]
Dividends paid (in dollars per share)			$ 0.25
Total dividends		$ 5,100,000
Common stock, outstanding (in shares)		20,443,918	20,292,420	20,292,420	20,161,395
Maximum investment under stock purchase and dividend reinvestment plan				$ 120,000
Shares issued pursuant to exercise of stock options (in shares)			15,150	63,825
Stock issued, increase in shareholders' equity			$ 349,000	$ 1,500,000
The 2015 Program
Class of Stock [Line Items]
Stock repurchase program, number of shares authorized to be repurchased						1,200,000
Shares repurchased during period			14,263
Shares remaining authorized for repurchase			$ 175,037	175,037
RSU's and PSU's
Class of Stock [Line Items]
Share based compensation expense			$ 708,000	$ 1,900,000
Maximum
Class of Stock [Line Items]
Shelf registration, shares registered			1,500,000	1,500,000
Maximum | The 2015 Program
Class of Stock [Line Items]
Stock repurchase program, authorized amount						$ 40,000,000
Subsequent Event
Class of Stock [Line Items]
Dividends declared per share (in dollars per share)	$ 0.25