Organization and Summary of Significant Accounting Policies (Intangibles and Per Share Information) (Details) - USD ($) shares in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Shares:
Weighted-average number of common shares outstanding	7,739	7,839	7,841	7,848	7,839	7,938	7,976	7,914	7,846	8,126	8,106	8,033	7,811	7,917	8,029
Dilutive and potentially dilutive common shares													171	224	260
Total shares	7,872	7,963	7,991	8,044	8,037	8,123	8,179	8,129	8,084	8,329	8,303	8,273	7,982	8,141	8,289
Indefinite lived intangible assets
Intangible Assets
Intangible assets with indefinite useful lives	$ 0												$ 0
Customer relationships
Intangible Assets
Useful life													5 years