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STOCK BASED COMPENSATION (Details Textual)
May 06, 2014
May 03, 2011
Stock based compensation    
Number of shares authorized under the Plan 1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized 750,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Options granted prior to the Plan [Member]    
Stock based compensation    
Number of shares counted against share limit   1hdng_Sharebasedcompensationnumberofsharescountedagainstsharelimit
/ us-gaap_PlanNameAxis
= hdng_Optionsgrantedpriortothe2011IncentiveStockPlanMember
Common stock issued under the Plan   1hdng_ShareBasedCompensationcommonsharesissuedunderincentivestockplan
/ us-gaap_PlanNameAxis
= hdng_Optionsgrantedpriortothe2011IncentiveStockPlanMember
Options granted pursuant to the Plan [Member]    
Stock based compensation    
Number of shares counted against share limit 1.75hdng_Sharebasedcompensationnumberofsharescountedagainstsharelimit
/ us-gaap_PlanNameAxis
= hdng_OptionsgrantedpursuanttothePlanMember		 2hdng_Sharebasedcompensationnumberofsharescountedagainstsharelimit
/ us-gaap_PlanNameAxis
= hdng_OptionsgrantedpursuanttothePlanMember
Common stock issued under the Plan 1hdng_ShareBasedCompensationcommonsharesissuedunderincentivestockplan
/ us-gaap_PlanNameAxis
= hdng_OptionsgrantedpursuanttothePlanMember		 1hdng_ShareBasedCompensationcommonsharesissuedunderincentivestockplan
/ us-gaap_PlanNameAxis
= hdng_OptionsgrantedpursuanttothePlanMember