Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Summary Of Significant Accounting Policies [Abstract]

Summary Of The Amortized Costs And Fair Values Of Marketable Securities

	(In thousands)
	MARKETABLE SECURITIES
	Amortized Cost		Fair Value		Gross Unrealized Gains		Gross Unrealized Losses
December 31, 2012
Tax-exempt Municipal Bonds	$	24,412	$	24,494	$	94	$	12
Variable Rate Demand Notes		31,092		31,092		-		-
Total Marketable Securities	$	55,504	$	55,586	$	94	$	12
December 31, 2011
Tax-exempt Municipal Bonds	$	26,214	$	26,326	$	128	$	16
Variable Rate Demand Notes		33,034		33,034		-		-
Total Marketable Securities	$	59,248	$	59,360	$	128	$	16

Schedule Of Estimated Future Amortization Expense

Years ending December 31:	(In thousands)
2013	$	667
2014		667
2015		667
2016		663
2017		550

Schedule Of Changes In Product Liability

	(In thousands)
	Year Ended December 31
	2012		2011
Beginning balance January 1	$	341	$	326
Accruals during the period		528		523
Charges / payments made under the warranties		(481)		(508)
Balance December 31	$	388	$	341