Stock Option Plans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 item	Dec. 31, 2013	Dec. 31, 2012
Stock Option Plans [Abstract]
Shares authorized to grant options	934,702
Stock option plans	2
Options exercised	118,823	61,677	67,916
Weighted-average grant-date fair value of options granted			$ 2.01
Authorized but unissued shares	934,702
Shares remaining to be granted under plan	101,642
Proceeds from stock options exercised	$ 1,300,000	$ 538,000	$ 551,000
Options exercised during the period, intrinsic value	$ 1,000,000	$ 377,000	$ 287,000
Options granted			58,000