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SELECTED QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sales $ 93,008us-gaap_SalesRevenueGoodsNet $ 68,924us-gaap_SalesRevenueGoodsNet $ 78,851us-gaap_SalesRevenueGoodsNet $ 70,850us-gaap_SalesRevenueGoodsNet $ 103,101us-gaap_SalesRevenueGoodsNet $ 79,784us-gaap_SalesRevenueGoodsNet $ 79,355us-gaap_SalesRevenueGoodsNet $ 67,219us-gaap_SalesRevenueGoodsNet $ 311,633us-gaap_SalesRevenueGoodsNet $ 329,459us-gaap_SalesRevenueGoodsNet $ 334,413us-gaap_SalesRevenueGoodsNet
Gross Profit 27,020us-gaap_GrossProfit 18,677us-gaap_GrossProfit 21,961us-gaap_GrossProfit 19,220us-gaap_GrossProfit 29,458us-gaap_GrossProfit 22,041us-gaap_GrossProfit 22,767us-gaap_GrossProfit 18,973us-gaap_GrossProfit 86,878us-gaap_GrossProfit 93,239us-gaap_GrossProfit 96,837us-gaap_GrossProfit
Net (loss) income from continuing operations 4,542us-gaap_IncomeLossFromContinuingOperations (7,578)us-gaap_IncomeLossFromContinuingOperations 1,349us-gaap_IncomeLossFromContinuingOperations (671)us-gaap_IncomeLossFromContinuingOperations 1,126us-gaap_IncomeLossFromContinuingOperations 1,173us-gaap_IncomeLossFromContinuingOperations 2,056us-gaap_IncomeLossFromContinuingOperations 40us-gaap_IncomeLossFromContinuingOperations (2,358)us-gaap_IncomeLossFromContinuingOperations 4,395us-gaap_IncomeLossFromContinuingOperations 17,855us-gaap_IncomeLossFromContinuingOperations
Gain from disposal of discontinued operation, net of tax 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 218us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 4,890us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 218us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 4,890us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Income from discontinued operations, net of tax         127us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax 306us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax 209us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax 642us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
Net (loss) income 4,542us-gaap_NetIncomeLoss (7,578)us-gaap_NetIncomeLoss 1,349us-gaap_NetIncomeLoss (453)us-gaap_NetIncomeLoss 6,143us-gaap_NetIncomeLoss 1,479us-gaap_NetIncomeLoss 2,265us-gaap_NetIncomeLoss 40us-gaap_NetIncomeLoss (2,140)us-gaap_NetIncomeLoss 9,927us-gaap_NetIncomeLoss 17,855us-gaap_NetIncomeLoss
Continuing operations (in dollars per share) $ 0.36us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.60)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.11us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.05)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.09us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.10us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.18us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.00us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.19)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.37us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.53us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Disposal of discontinued operation (in dollars per share) $ 0.00us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare $ 0.00us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare $ 0.00us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare $ 0.01us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare $ 0.40us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare $ 0.00us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare $ 0.00us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare $ 0.00us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare $ 0.02us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare $ 0.41us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare $ 0.00us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare
Discontinued operations (in dollars per share)         $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.03us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.06us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Basic (loss) earnings per share (in dollars per share) $ 0.36us-gaap_EarningsPerShareBasic $ (0.60)us-gaap_EarningsPerShareBasic $ 0.11us-gaap_EarningsPerShareBasic $ (0.04)us-gaap_EarningsPerShareBasic $ 0.50us-gaap_EarningsPerShareBasic $ 0.13us-gaap_EarningsPerShareBasic $ 0.19us-gaap_EarningsPerShareBasic $ 0.00us-gaap_EarningsPerShareBasic $ (0.17)us-gaap_EarningsPerShareBasic $ 0.84us-gaap_EarningsPerShareBasic $ 1.53us-gaap_EarningsPerShareBasic
Continuing operations (in dollars per share) $ 0.35us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (0.60)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.11us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (0.05)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.09us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.10us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.18us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.00us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (0.19)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.37us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.53us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Disposal of discontinued operation (in dollars per share) $ 0.00us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.00us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.00us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.01us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.40us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.00us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.00us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.00us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.02us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.41us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.00us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare
Discontinued operations (in dollars per share)         $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.03us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.05us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Diluted (loss) earnings per share (in dollars per share) $ 0.35us-gaap_EarningsPerShareDiluted $ (0.60)us-gaap_EarningsPerShareDiluted $ 0.11us-gaap_EarningsPerShareDiluted $ (0.04)us-gaap_EarningsPerShareDiluted $ 0.50us-gaap_EarningsPerShareDiluted $ 0.13us-gaap_EarningsPerShareDiluted $ 0.19us-gaap_EarningsPerShareDiluted $ 0.00us-gaap_EarningsPerShareDiluted $ (0.17)us-gaap_EarningsPerShareDiluted $ 0.83us-gaap_EarningsPerShareDiluted $ 1.53us-gaap_EarningsPerShareDiluted
Denominator for basic (loss) earnings per share - weighted average shares (in shares) 12,716us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,715us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,715us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,499us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,160us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 11,721us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 11,663us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 11,660us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,661us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 11,801us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 11,557us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Denominator for diluted (loss) earnings per share - adjusted weighted average shares (in shares) 12,832us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 12,715us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 12,820us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 12,499us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 12,253us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,813us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,754us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,743us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 12,661us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,891us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,596us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Forkardt Swiss Operations [Member]                      
Sales                   6,100us-gaap_SalesRevenueGoodsNet
/ us-gaap_BusinessAcquisitionAxis
= hdng_ForkardtSwissOperationsMember		  
Net (loss) income                   $ 600us-gaap_NetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= hdng_ForkardtSwissOperationsMember