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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net income $ 2,414us-gaap_NetIncomeLoss $ 2,140us-gaap_NetIncomeLoss
Depreciation and amortization 886us-gaap_DepreciationDepletionAndAmortization 879us-gaap_DepreciationDepletionAndAmortization
Deferred income taxes (101)us-gaap_DeferredIncomeTaxExpenseBenefit (78)us-gaap_DeferredIncomeTaxExpenseBenefit
Other, net 80us-gaap_OtherNoncashIncomeExpense 85us-gaap_OtherNoncashIncomeExpense
Change in assets and liabilities:    
Accounts receivable, net (3,427)us-gaap_IncreaseDecreaseInAccountsReceivable (4,194)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories, net (34)us-gaap_IncreaseDecreaseInInventories (1,970)us-gaap_IncreaseDecreaseInInventories
Accounts payable and accrued liabilities (3,537)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (199)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Accounts with affiliates 688us-gaap_IncreaseDecreaseInDueToAffiliates 882us-gaap_IncreaseDecreaseInDueToAffiliates
Other, net 26us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 117us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash used in operating activities (3,005)us-gaap_NetCashProvidedByUsedInOperatingActivities (2,338)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities -    
Capital expenditures (790)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (747)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Cash flows from financing activities -    
Dividends paid (620)us-gaap_PaymentsOfDividendsCommonStock (619)us-gaap_PaymentsOfDividendsCommonStock
Cash and cash equivalents - net change from:    
Operating, investing and financing activities (4,415)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (3,704)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Balance at beginning of period 45,570us-gaap_CashAndCashEquivalentsAtCarryingValue 38,753us-gaap_CashAndCashEquivalentsAtCarryingValue
Balance at end of period 41,155us-gaap_CashAndCashEquivalentsAtCarryingValue 35,049us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosures - cash paid for:    
Income taxes $ 701us-gaap_IncomeTaxesPaidNet $ 341us-gaap_IncomeTaxesPaidNet