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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 24,392us-gaap_CashAndCashEquivalentsAtCarryingValue $ 34,052us-gaap_CashAndCashEquivalentsAtCarryingValue
Receivables, less allowance for doubtful accounts of $476 at March 31, 2015 and $502 at December 31, 2014 18,223us-gaap_ReceivablesNetCurrent 16,470us-gaap_ReceivablesNetCurrent
Inventories 12,925us-gaap_InventoryNet 12,893us-gaap_InventoryNet
Prepaid expenses 2,060us-gaap_PrepaidExpenseCurrent 664us-gaap_PrepaidExpenseCurrent
Refundable income taxes 2,579us-gaap_IncomeTaxesReceivable 3,192us-gaap_IncomeTaxesReceivable
Deferred income taxes 1,150us-gaap_DeferredTaxAssetsNetCurrent 1,142us-gaap_DeferredTaxAssetsNetCurrent
Total current assets 61,329us-gaap_AssetsCurrent 68,413us-gaap_AssetsCurrent
Property, plant and equipment 84,178us-gaap_PropertyPlantAndEquipmentGross 75,823us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization (41,887)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (40,980)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net property, plant and equipment 42,291us-gaap_PropertyPlantAndEquipmentNet 34,843us-gaap_PropertyPlantAndEquipmentNet
Goodwill 7,322us-gaap_Goodwill 7,322us-gaap_Goodwill
Intangible assets, net 874us-gaap_IntangibleAssetsNetExcludingGoodwill 953us-gaap_IntangibleAssetsNetExcludingGoodwill
Other assets 2,210us-gaap_OtherAssetsNoncurrent 2,159us-gaap_OtherAssetsNoncurrent
Total assets 114,026us-gaap_Assets 113,690us-gaap_Assets
Current liabilities:    
Accounts payable 4,336us-gaap_AccountsPayableCurrent 5,398us-gaap_AccountsPayableCurrent
Accrued expenses 4,502us-gaap_AccruedLiabilitiesCurrent 5,222us-gaap_AccruedLiabilitiesCurrent
Current installments of long-term debt 998us-gaap_LongTermDebtCurrent 993us-gaap_LongTermDebtCurrent
Total current liabilities 9,836us-gaap_LiabilitiesCurrent 11,613us-gaap_LiabilitiesCurrent
Long-term debt, excluding current installments 1,621us-gaap_LongTermDebtNoncurrent 1,873us-gaap_LongTermDebtNoncurrent
Deferred income taxes 3,692us-gaap_DeferredTaxLiabilitiesNoncurrent 3,588us-gaap_DeferredTaxLiabilitiesNoncurrent
Retirement and other liabilities 1,790us-gaap_PostemploymentBenefitsLiabilityNoncurrent 1,624us-gaap_PostemploymentBenefitsLiabilityNoncurrent
Total liabilities 16,939us-gaap_Liabilities 18,698us-gaap_Liabilities
Commitments and contingencies      
Stockholders' equity:    
Preferred stock, $.01 par value. Authorized 1,000,000 shares; zero shares issued or outstanding      
Common stock, $.01 par value. Authorized 20,000,000 shares; issued and outstanding 7,108,094 at March 31, 2015 and 7,068,815 at December 31, 2014 71us-gaap_CommonStockValue 71us-gaap_CommonStockValue
Additional paid-in capital 22,574us-gaap_AdditionalPaidInCapital 22,132us-gaap_AdditionalPaidInCapital
Retained earnings 74,442us-gaap_RetainedEarningsAccumulatedDeficit 72,789us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 97,087us-gaap_StockholdersEquity 94,992us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 114,026us-gaap_LiabilitiesAndStockholdersEquity $ 113,690us-gaap_LiabilitiesAndStockholdersEquity