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STOCK BASED COMPENSATION (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Restricted stock/units awards    
Stock-based compensation    
Stock based compensation expenses $ 111us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= hdng_RestrictedStockAndRestrictedStockUnitsMember		 $ 109us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= hdng_RestrictedStockAndRestrictedStockUnitsMember
Unrecognized compensation and expected weighted-average recognition period    
Unrecognized compensation cost 610us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= hdng_RestrictedStockAndRestrictedStockUnitsMember		 718us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= hdng_RestrictedStockAndRestrictedStockUnitsMember
Expected weighted-average recognition period for unrecognized compensation cost (in years) 1 year 4 months 20 days 1 year 7 months 20 days
Performance share incentives    
Unrecognized compensation and expected weighted-average recognition period    
Unrecognized compensation cost $ 554us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 $ 554us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Expected weighted-average recognition period for unrecognized compensation cost (in years) 1 year 10 months 17 days 2 years 1 month 17 days