Shareholders' Equity (Details) - USD ($)			1 Months Ended	3 Months Ended	6 Months Ended
	Jul. 19, 2018	May 01, 2018	Mar. 31, 2015	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Aug. 06, 2015
Class of Stock [Line Items]
Dividends paid (in dollars per share)				$ 0.22
Total dividends		$ 4,500,000
Common stock, outstanding (in shares)		20,446,221		20,242,893	20,242,893	20,161,395
Maximum investment under stock purchase and dividend reinvestment plan			$ 120,000
Shares issued pursuant to exercise of stock options (in shares)				4,750	48,675
Stock issued, increase in shareholders' equity				$ 115,000	$ 1,100,000
Stock repurchase program, number of shares authorized to be repurchased				0	0
The 2015 Program
Class of Stock [Line Items]
Stock repurchase program, number of shares authorized to be repurchased							1,200,000
Shares remaining authorized for repurchase				$ 189,300	$ 189,300
RSU's and PSU's
Class of Stock [Line Items]
Share based compensation expense				$ 615,000	$ 1,200,000
Maximum
Class of Stock [Line Items]
Shelf registration, shares registered			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