Shareholders' Equity (Detail Textuals)	12 Months Ended
	Dec. 31, 2017 shares
Equity, Class of Treasury Stock [Line Items]
Shares purchased during period (in shares)	3,926
Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Number of common shares authorized to be purchased (in shares)	450,000
Shares purchased during period (in shares)	349,330
Remaining number of shares authorized to be purchased (in shares)	100,670