XML 14 R48.htm IDEA: XBRL DOCUMENT v2.4.1.9
Equity (Details 2) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Additional information      
Compensation expense $ 179,000us-gaap_AllocatedShareBasedCompensationExpense $ 330,000us-gaap_AllocatedShareBasedCompensationExpense  
Restricted Stock Units (RSUs)      
Additional information      
Compensation expense 50,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
   
Additional compensation expense expected to be recognized 34,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
   
Period for recognition of additional compensation expense 2 months    
Number of unrestricted common shares that the Director is entitled to receive for each vested RSU, upon termination from board service 1aumn_NumberOfSharesOfCommonStockEntitledToDirectorUponTerminationFromBoardOfDirectors
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
   
Equity Plan | Restricted Stock      
Number of Shares      
Outstanding at beginning of year (in shares) 600,838us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= aumn_EquityIncentivePlan2009Member
   
Restrictions lifted during the year (in shares) (8,833)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= aumn_EquityIncentivePlan2009Member
   
Outstanding at end of year (in shares) 592,005us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= aumn_EquityIncentivePlan2009Member
   
Weighted Average Grant Date Fair Value Per Share      
Outstanding at beginning of year (in dollars per share) $ 1.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= aumn_EquityIncentivePlan2009Member
   
Restrictions lifted during the year (in dollars per share) $ 8.64us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= aumn_EquityIncentivePlan2009Member
   
Outstanding at end of year (in dollars per share) $ 1.37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= aumn_EquityIncentivePlan2009Member
   
Additional information      
Compensation expense 100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= aumn_EquityIncentivePlan2009Member
   
Additional compensation expense expected to be recognized $ 300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= aumn_EquityIncentivePlan2009Member
   
Period for recognition of additional compensation expense 34 months    
Equity Plan | Restricted Stock | Officers and Employees      
Number of Shares      
Restrictions lifted during the year (in shares) (8,833)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= aumn_EquityIncentivePlan2009Member
/ us-gaap_TitleOfIndividualAxis
= aumn_OfficersAndEmployeesMember
   
Equity Plan | Employee and Directors Stock Options      
Number of Shares      
Outstanding at beginning of period (in shares)     245,810us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= aumn_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_PlanNameAxis
= aumn_EquityIncentivePlan2009Member
Outstanding at end of year (in shares) 245,810us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= aumn_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_PlanNameAxis
= aumn_EquityIncentivePlan2009Member
  245,810us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= aumn_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_PlanNameAxis
= aumn_EquityIncentivePlan2009Member
Exercisable at end of period (in shares) 245,810us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= aumn_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_PlanNameAxis
= aumn_EquityIncentivePlan2009Member
   
Granted and vested (in shares) 95,810us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= aumn_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_PlanNameAxis
= aumn_EquityIncentivePlan2009Member
   
Weighted Average Exercise Price Per Share      
Outstanding at beginning of year (in dollars per share)     $ 3.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= aumn_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_PlanNameAxis
= aumn_EquityIncentivePlan2009Member
Outstanding at end of year (in dollars per share) $ 3.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= aumn_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_PlanNameAxis
= aumn_EquityIncentivePlan2009Member
  $ 3.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= aumn_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_PlanNameAxis
= aumn_EquityIncentivePlan2009Member
Exercisable at end of period (in dollars per share) $ 3.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= aumn_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_PlanNameAxis
= aumn_EquityIncentivePlan2009Member
   
Granted and vested (in dollars per share) $ 8.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= aumn_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_PlanNameAxis
= aumn_EquityIncentivePlan2009Member
   
Deferred Compensation Plan | Restricted Stock Units (RSUs)      
Number of Shares      
Outstanding at beginning of year (in shares)     935,285us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= aumn_NonEmployeeDirectorsDeferredCompensationAndEquityAwardPlanMember
Outstanding at end of year (in shares) 935,285us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= aumn_NonEmployeeDirectorsDeferredCompensationAndEquityAwardPlanMember
  935,285us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= aumn_NonEmployeeDirectorsDeferredCompensationAndEquityAwardPlanMember
Weighted Average Grant Date Fair Value Per Share      
Outstanding at beginning of year (in dollars per share)     $ 2.08us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= aumn_NonEmployeeDirectorsDeferredCompensationAndEquityAwardPlanMember
Outstanding at end of year (in dollars per share) $ 2.08us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= aumn_NonEmployeeDirectorsDeferredCompensationAndEquityAwardPlanMember
  $ 2.08us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= aumn_NonEmployeeDirectorsDeferredCompensationAndEquityAwardPlanMember