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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 527us-gaap_CashAndCashEquivalentsAtCarryingValue $ 588us-gaap_CashAndCashEquivalentsAtCarryingValue
Trade and other receivables, less allowance for doubtful accounts of $755 and $685 58,310us-gaap_ReceivablesNetCurrent 72,470us-gaap_ReceivablesNetCurrent
Costs and estimated earnings in excess of billings on uncompleted contracts 45,847us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear 50,468us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
Inventories 72,779us-gaap_InventoryNet 110,392us-gaap_InventoryNet
Refundable income taxes 5,031us-gaap_IncomeTaxesReceivable 1,073us-gaap_IncomeTaxesReceivable
Deferred income taxes 5,487us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 6,208us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Prepaid expenses and other 7,258us-gaap_PrepaidExpenseAndOtherAssetsCurrent 2,381us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 195,239us-gaap_AssetsCurrent 243,580us-gaap_AssetsCurrent
Property and equipment, net 132,595us-gaap_PropertyPlantAndEquipmentNet 143,061us-gaap_PropertyPlantAndEquipmentNet
Goodwill 5,282us-gaap_Goodwill 25,760us-gaap_Goodwill
Other assets 18,766us-gaap_OtherAssetsNoncurrent 21,058us-gaap_OtherAssetsNoncurrent
Total assets 351,882us-gaap_Assets 433,459us-gaap_Assets
Current liabilities:    
Current portion of long-term debt   5,714us-gaap_LongTermDebtCurrent
Current portion of capital lease obligations 2,170us-gaap_CapitalLeaseObligationsCurrent 2,216us-gaap_CapitalLeaseObligationsCurrent
Accounts payable 15,480us-gaap_AccountsPayableCurrent 21,731us-gaap_AccountsPayableCurrent
Accrued liabilities 8,752us-gaap_AccruedLiabilitiesCurrent 10,302us-gaap_AccruedLiabilitiesCurrent
Deferred revenue 319us-gaap_DeferredRevenueCurrent 4,892us-gaap_DeferredRevenueCurrent
Billings in excess of costs and estimated earnings on uncompleted contracts 2,835us-gaap_BillingsInExcessOfCostCurrent 3,368us-gaap_BillingsInExcessOfCostCurrent
Total current liabilities 29,556us-gaap_LiabilitiesCurrent 48,223us-gaap_LiabilitiesCurrent
Borrowings on line of credit 45,587us-gaap_LongTermLineOfCredit 87,919us-gaap_LongTermLineOfCredit
Long-term debt, less current portion   643us-gaap_LongTermDebtNoncurrent
Capital lease obligations, less current portion 225us-gaap_CapitalLeaseObligationsNoncurrent 5,679us-gaap_CapitalLeaseObligationsNoncurrent
Deferred income taxes 14,015us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 11,842us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Pension and other long-term liabilities 16,864us-gaap_OtherLiabilitiesNoncurrent 17,303us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 106,247us-gaap_Liabilities 171,609us-gaap_Liabilities
Commitments and contingencies (Note 13)      
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, 9,520,067 and 9,449,299 shares issued and outstanding 95us-gaap_CommonStockValue 94us-gaap_CommonStockValue
Additional paid-in-capital 116,802us-gaap_AdditionalPaidInCapitalCommonStock 114,559us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 130,571us-gaap_RetainedEarningsAccumulatedDeficit 148,458us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (1,833)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (1,261)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 245,635us-gaap_StockholdersEquity 261,850us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 351,882us-gaap_LiabilitiesAndStockholdersEquity $ 433,459us-gaap_LiabilitiesAndStockholdersEquity