XML 45 R53.htm IDEA: XBRL DOCUMENT v2.4.1.9
SHAREHOLDERS' EQUITY (Details Textual) (USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2010
Dec. 31, 2001
Class of Stock [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 1.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 1.28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 1.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue    
Share Based Compensation Arrangement By Share Based Payment Award Remaining Number Of Shares Available For Grant 738,000ams_ShareBasedCompensationArrangementByShareBasedPaymentAwardRemainingNumberOfSharesAvailableForGrant        
Stock Repurchase Program, Number of Shares Authorized to be Repurchased         1,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 72,000us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased        
Stock Repurchased During Period, Shares 1,000us-gaap_StockRepurchasedDuringPeriodShares   9,000us-gaap_StockRepurchasedDuringPeriodShares    
Allocated Share-based Compensation Expense $ 51,000us-gaap_AllocatedShareBasedCompensationExpense $ 88,000us-gaap_AllocatedShareBasedCompensationExpense $ 74,000us-gaap_AllocatedShareBasedCompensationExpense    
Incentive Compensation Plan [Member]          
Class of Stock [Line Items]          
Common Stock, Capital Shares Reserved for Future Issuance       1,630,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= ams_IncentiveCompensationPlanMember
 
Provision For Reduction Of Reserved Shares       1.59ams_ProvisionForReductionOfReservedShares
/ us-gaap_PlanNameAxis
= ams_IncentiveCompensationPlanMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Shares Purchased for Award       2,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward
/ us-gaap_PlanNameAxis
= ams_IncentiveCompensationPlanMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 138,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ams_IncentiveCompensationPlanMember
       
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       5 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 2.64us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= ams_IncentiveCompensationPlanMember
       
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value 6,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_PlanNameAxis
= ams_IncentiveCompensationPlanMember
       
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options 732,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_PlanNameAxis
= ams_IncentiveCompensationPlanMember
       
Employee Benefits and Share-based Compensation, Total 7,000us-gaap_EmployeeBenefitsAndShareBasedCompensation
/ us-gaap_PlanNameAxis
= ams_IncentiveCompensationPlanMember
       
Offsetting Tax Benefit 1,900ams_OffsettingTaxBenefit
/ us-gaap_PlanNameAxis
= ams_IncentiveCompensationPlanMember
       
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total 2,100us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= ams_IncentiveCompensationPlanMember
       
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 5 years        
Weighted Average Number of Shares, Restricted Stock 3,000us-gaap_WeightedAverageNumberOfSharesRestrictedStock
/ us-gaap_PlanNameAxis
= ams_IncentiveCompensationPlanMember
       
Incentive Compensation Plan [Member] | Non Employee Directors [Member]          
Class of Stock [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ams_IncentiveCompensationPlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ams_NonEmployeeDirectorsMember
 
Incentive Compensation Plan [Member] | Non Employee Directors and Corporate Secretary [Member]          
Class of Stock [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 23,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ams_IncentiveCompensationPlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ams_NonEmployeeDirectorsAndCorporateSecretaryMember
       
Stock Issued During Period, Shares, Restricted Stock Award, Gross 3,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_PlanNameAxis
= ams_IncentiveCompensationPlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ams_NonEmployeeDirectorsAndCorporateSecretaryMember
       
Retainer Fees [Member]          
Class of Stock [Line Items]          
Employee Benefits and Share-based Compensation, Total $ 80,000us-gaap_EmployeeBenefitsAndShareBasedCompensation
/ us-gaap_StatementClassOfStockAxis
= ams_RetainerFeesMember
       
Retainer Fees [Member] | Incentive Compensation Plan [Member] | Non Employee Directors [Member]          
Class of Stock [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 115,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ams_IncentiveCompensationPlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ams_NonEmployeeDirectorsMember
/ us-gaap_StatementClassOfStockAxis
= ams_RetainerFeesMember
       
Retainer Fees [Member] | Incentive Compensation Plan [Member] | Non Employee Directors and Corporate Secretary [Member]          
Class of Stock [Line Items]          
Stock Issued During Period, Shares, Restricted Stock Award, Gross 30,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_PlanNameAxis
= ams_IncentiveCompensationPlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ams_NonEmployeeDirectorsAndCorporateSecretaryMember
/ us-gaap_StatementClassOfStockAxis
= ams_RetainerFeesMember