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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Consolidated Statements Of Comprehensive Income [Abstract]
Net Sales	$ 7,041us-gaap_SalesRevenueNet	$ 6,541us-gaap_SalesRevenueNet
Cost of Goods Sold	2,955us-gaap_CostOfGoodsSold	2,798us-gaap_CostOfGoodsSold
Gross Profit	4,086us-gaap_GrossProfit	3,743us-gaap_GrossProfit
Operating Expenses
Selling and marketing	1,556us-gaap_SellingAndMarketingExpense	1,442us-gaap_SellingAndMarketingExpense
General and administrative	1,329us-gaap_GeneralAndAdministrativeExpense	1,352us-gaap_GeneralAndAdministrativeExpense
Research and development	810us-gaap_ResearchAndDevelopmentExpense	560us-gaap_ResearchAndDevelopmentExpense
Total Operating Expenses	3,695us-gaap_OperatingExpenses	3,354us-gaap_OperatingExpenses
Operating Income	391us-gaap_OperatingIncomeLoss	389us-gaap_OperatingIncomeLoss
Non-operating Income (Expense)
Gain on sale of available-for-sale securities	1,163us-gaap_GainLossOnInvestments	530us-gaap_GainLossOnInvestments
Other income	15us-gaap_OtherNonoperatingIncome	14us-gaap_OtherNonoperatingIncome
Interest income	2us-gaap_InvestmentIncomeInterest	5us-gaap_InvestmentIncomeInterest
Interest expense	(17)us-gaap_InterestExpenseDebt	0us-gaap_InterestExpenseDebt
Total Non-operating Income, Net	1,163us-gaap_NonoperatingIncomeExpense	549us-gaap_NonoperatingIncomeExpense
Income before Income Taxes	1,554us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	938us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income Taxes	460us-gaap_IncomeTaxExpenseBenefit	232us-gaap_IncomeTaxExpenseBenefit
Net Income	1,094us-gaap_NetIncomeLoss	706us-gaap_NetIncomeLoss
Other Comprehensive Income (Loss)
Change in unrealized value of available-for-sale securities, net of income tax	(176)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	(262)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification of gains included in net income, net of income tax	(721)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	(329)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Net decrease in comprehensive income	(897)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	(591)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Net Comprehensive Income	$ 197us-gaap_ComprehensiveIncomeNetOfTax	$ 115us-gaap_ComprehensiveIncomeNetOfTax
Basic
Net income per share	$ 0.32us-gaap_EarningsPerShareBasic	$ 0.20us-gaap_EarningsPerShareBasic
Weighted average shares	3,395,510us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	3,394,208us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted
Net income per share	$ 0.30us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted
Weighted average shares	3,654,382us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	3,496,873us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Dividends paid per common share	$ 0.00us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.08us-gaap_CommonStockDividendsPerShareCashPaid

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Aggregate dividends paid during the period for each share of common stock outstanding.

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