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Consolidated Balance Sheets (USD $)
Apr. 30, 2015
Jan. 31, 2015
CURRENT ASSETS    
Cash and cash equivalents $ 274,528,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 333,691,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 56,017,000us-gaap_ShortTermInvestments  
Accounts receivable, net of allowance for doubtful accounts 34,500,000us-gaap_AccountsReceivableNetCurrent 27,330,000us-gaap_AccountsReceivableNetCurrent
Costs and estimated earnings in excess of billings 595,000us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms 455,000us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms
Notes receivable and accrued interest 2,025,000us-gaap_NotesAndLoansReceivableNetCurrent 1,786,000us-gaap_NotesAndLoansReceivableNetCurrent
Prepaid expenses and other current assets 4,340,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 1,092,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
TOTAL CURRENT ASSETS 372,005,000us-gaap_AssetsCurrent 364,354,000us-gaap_AssetsCurrent
Property, plant and equipment, net of accumulated depreciation (including $3,729,000 and $2,658,000 in costs related to the variable interest entity as of April 30 and January 31, 2015, respectively) 7,606,000us-gaap_PropertyPlantAndEquipmentNet 6,518,000us-gaap_PropertyPlantAndEquipmentNet
Goodwill 18,476,000us-gaap_Goodwill 18,476,000us-gaap_Goodwill
Intangible assets, net of accumulated amortization 1,785,000us-gaap_IntangibleAssetsNetExcludingGoodwill 1,845,000us-gaap_IntangibleAssetsNetExcludingGoodwill
TOTAL ASSETS 399,872,000us-gaap_Assets 391,193,000us-gaap_Assets
CURRENT LIABILITIES    
Accounts payable 29,914,000us-gaap_AccountsPayableCurrent 37,691,000us-gaap_AccountsPayableCurrent
Accrued expenses 19,061,000us-gaap_AccruedLiabilitiesCurrent 15,976,000us-gaap_AccruedLiabilitiesCurrent
Billings in excess of costs and estimated earnings 162,973,000us-gaap_BillingsInExcessOfCost 161,564,000us-gaap_BillingsInExcessOfCost
Deferred income tax liabilities 462,000us-gaap_DeferredTaxLiabilitiesGrossCurrent 201,000us-gaap_DeferredTaxLiabilitiesGrossCurrent
TOTAL CURRENT LIABILITIES 212,410,000us-gaap_LiabilitiesCurrent 215,432,000us-gaap_LiabilitiesCurrent
Deferred income tax liabilities 419,000us-gaap_DeferredTaxLiabilitiesGrossNoncurrent 809,000us-gaap_DeferredTaxLiabilitiesGrossNoncurrent
TOTAL LIABILITIES 212,829,000us-gaap_Liabilities 216,241,000us-gaap_Liabilities
COMMITMENTS AND CONTINGENCIES (Note 9)      
STOCKHOLDERS' EQUITY    
Preferred stock, par value $0.10 per share - 500,000 shares authorized; no shares issued and outstanding      
Common stock, par value $0.15 per share - 30,000,000 shares authorized; 14,672,184 and 14,634,434 shares issued at April 30 and January 31, 2015, respectively; 14,668,951 and 14,631,201 shares outstanding at April 30 and January 31, 2015, respectively 2,201,000us-gaap_CommonStockValue 2,195,000us-gaap_CommonStockValue
Additional paid-in capital 110,930,000us-gaap_AdditionalPaidInCapitalCommonStock 109,696,000us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 81,117,000us-gaap_RetainedEarningsAccumulatedDeficit 73,614,000us-gaap_RetainedEarningsAccumulatedDeficit
Treasury stock, at cost - 3,233 shares at April 30 and January 31, 2015 (33,000)us-gaap_TreasuryStockValue (33,000)us-gaap_TreasuryStockValue
TOTAL STOCKHOLDERS' EQUITY 194,215,000us-gaap_StockholdersEquity 185,472,000us-gaap_StockholdersEquity
Noncontrolling interests (Note 2) (7,172,000)us-gaap_MinorityInterest (10,520,000)us-gaap_MinorityInterest
TOTAL EQUITY 187,043,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 174,952,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
TOTAL LIABILITIES AND EQUITY $ 399,872,000us-gaap_LiabilitiesAndStockholdersEquity $ 391,193,000us-gaap_LiabilitiesAndStockholdersEquity