Business and Significant Accounting Policies (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Accounts Receivable, Allowances for Doubtful Accounts and Cash Discounts
Cash discount (as a percent)	2.00%
Available-for-Sale Securities
Minimum maturity period for available-for-sale securities	12 months
Minimum maturity period for available-for-sale securities to support current operations securities to classify as current assets	12 months
Allowance for doubtful accounts
Accounts Receivable, Allowances for Doubtful Accounts and Cash Discounts
Accounts receivable and allowance for doubtful accounts	$ 0	$ 0
Reserve for cash discount
Accounts Receivable, Allowances for Doubtful Accounts and Cash Discounts
Allowance for cash discounts	$ 134,000	$ 57,000