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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 116us-gaap_CashAndCashEquivalentsAtCarryingValue $ 527us-gaap_CashAndCashEquivalentsAtCarryingValue
Trade and other receivables, less allowance for doubtful accounts of $672 and $755 32,128us-gaap_ReceivablesNetCurrent 58,310us-gaap_ReceivablesNetCurrent
Costs and estimated earnings in excess of billings on uncompleted contracts 52,553us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear 45,847us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
Inventories 61,283us-gaap_InventoryNet 72,779us-gaap_InventoryNet
Refundable income taxes 3,925us-gaap_IncomeTaxesReceivable 5,031us-gaap_IncomeTaxesReceivable
Deferred income taxes 6,218us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 5,487us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Prepaid expenses and other 7,087us-gaap_PrepaidExpenseAndOtherAssetsCurrent 7,258us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 163,310us-gaap_AssetsCurrent 195,239us-gaap_AssetsCurrent
Property and equipment, less accumulated depreciation and amortization of $85,183 and $84,224 132,848us-gaap_PropertyPlantAndEquipmentNet 132,595us-gaap_PropertyPlantAndEquipmentNet
Goodwill 5,282us-gaap_Goodwill 5,282us-gaap_Goodwill
Other assets 19,313us-gaap_OtherAssetsNoncurrent 18,766us-gaap_OtherAssetsNoncurrent
Total assets 320,753us-gaap_Assets 351,882us-gaap_Assets
Current liabilities:    
Current portion of capital lease obligations 1,927us-gaap_CapitalLeaseObligationsCurrent 2,170us-gaap_CapitalLeaseObligationsCurrent
Accounts payable 9,421us-gaap_AccountsPayableCurrent 15,480us-gaap_AccountsPayableCurrent
Accrued liabilities 9,103us-gaap_AccruedLiabilitiesCurrent 9,071us-gaap_AccruedLiabilitiesCurrent
Billings in excess of costs and estimated earnings on uncompleted contracts 1,462us-gaap_BillingsInExcessOfCostCurrent 2,835us-gaap_BillingsInExcessOfCostCurrent
Total current liabilities 21,913us-gaap_LiabilitiesCurrent 29,556us-gaap_LiabilitiesCurrent
Borrowings on line of credit 24,823us-gaap_LongTermLineOfCredit 45,587us-gaap_LongTermLineOfCredit
Capital lease obligations, less current portion 180us-gaap_CapitalLeaseObligationsNoncurrent 225us-gaap_CapitalLeaseObligationsNoncurrent
Deferred income taxes 14,194us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 14,015us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Pension and other long-term liabilities 16,119us-gaap_OtherLiabilitiesNoncurrent 16,864us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 77,229us-gaap_Liabilities 106,247us-gaap_Liabilities
Commitments and contingencies (Note 6)      
Stockholders' equity:    
Preferred stock, $.01 par value, 10,000,000 shares authorized, none issued or outstanding      
Common stock, $.01 par value, 15,000,000 shares authorized, 9,554,222 and 9,520,067 shares issued and outstanding 96us-gaap_CommonStockValue 95us-gaap_CommonStockValue
Additional paid-in-capital 116,697us-gaap_AdditionalPaidInCapitalCommonStock 116,802us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 128,470us-gaap_RetainedEarningsAccumulatedDeficit 130,571us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (1,739)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (1,833)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 243,524us-gaap_StockholdersEquity 245,635us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 320,753us-gaap_LiabilitiesAndStockholdersEquity $ 351,882us-gaap_LiabilitiesAndStockholdersEquity