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Balance Sheets (Unaudited) (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
OTHER PHYSICAL PROPERTY:    
Other physical property, accumulated depreciation $ 292us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 286us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
CURRENT ASSETS:    
Receivables, reserves $ 352us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 325us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
COMMON STOCKHOLDERS' EQUITY:    
Common stock, par value (in dollars per share) $ 0us-gaap_CommonStockNoParValue $ 0us-gaap_CommonStockNoParValue
Common stock, authorized (in shares) 46,500,000us-gaap_CommonStockSharesAuthorized 46,500,000us-gaap_CommonStockSharesAuthorized
Common stock, issued (in shares) 12,855,704us-gaap_CommonStockSharesIssued 12,830,521us-gaap_CommonStockSharesIssued
Common stock, outstanding (in shares) 12,855,704us-gaap_CommonStockSharesOutstanding 12,830,521us-gaap_CommonStockSharesOutstanding
Preferred stock, authorized (in shares) 500,000us-gaap_PreferredStockSharesAuthorized 500,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, issued (in shares) 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued