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SHAREHOLDERS' EQUITY (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2014
Jun. 30, 2012
Jun. 30, 2009
Jun. 30, 2007
Jun. 30, 2005
Fair value assumptions [Abstract]                  
Expected life 4 years 6 months [1] 5 years [1] 5 years 1 month 6 days [1]            
Risk-free interest rate (in hundredths) 1.45%us-gaap_FairValueAssumptionsRiskFreeInterestRate [2] 0.90%us-gaap_FairValueAssumptionsRiskFreeInterestRate [2] 0.88%us-gaap_FairValueAssumptionsRiskFreeInterestRate [2]            
Expected volatility (in hundredths) 35.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate [3] 50.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate [3] 50.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate [3]            
Expected dividend yield (in hundredths) 6.05%us-gaap_FairValueAssumptionsExpectedDividendRate 5.05%us-gaap_FairValueAssumptionsExpectedDividendRate 4.91%us-gaap_FairValueAssumptionsExpectedDividendRate            
Expected forfeiture (in hundredths) 18.32%bdms_ExpectedForfeiture [4] 17.77%bdms_ExpectedForfeiture [4] 1.26%bdms_ExpectedForfeiture [4]            
Options outstanding [Rollforward]                  
Outstanding, beginning (in shares) 482,833us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 477,767us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 410,689us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber            
Option granted (in shares) 210,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 89,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 132,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross            
Exercised (in shares) (10,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised (53,501)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised (34,422)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised            
Canceled (in shares) (96,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod (30,433)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod (30,500)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod            
Outstanding, ending (in shares) 586,833us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 482,833us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 477,767us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 410,689us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber          
Exercisable (in shares) 322,834us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber 276,169us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber 224,437us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber            
Options weighted average exercise price [Roll Forward]                  
Outstanding, beginning (in dollars per share) $ 18.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 18.63us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 18.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice            
Granted (in dollars per share) $ 14.75us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice $ 17.41us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice $ 17.97us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice            
Exercised (in dollars per share) $ 10.75us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice $ 18.27us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice $ 14.35us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice            
Canceled (in dollars per share) $ 18.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice $ 18.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice $ 17.61us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice            
Outstanding, ending (in dollars per share) $ 17.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 18.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 18.63us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 18.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice          
Exercisable (in dollars per share) $ 18.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice $ 18.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice $ 19.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice            
Options, additional disclosures [Abstract]                  
Outstanding, weighted average remaining contractual term 4 years 2 months 12 days 3 years 10 months 24 days 4 years 3 months 18 days 4 years          
Outstanding, aggregate intrinsic value $ 197,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue $ 214,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue $ 223,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue $ 219,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue          
Exercisable, weighted average remaining contractual term 2 years 4 months 24 days 2 years 10 months 24 days 3 years 1 month 6 days            
Exercisable, aggregate intrinsic value 23,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 152,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 126,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1            
Minimum [Member]                  
Range of Exercise Prices [Abstract]                  
Outstanding, beginning of period (in dollars per share) $ 10.75bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingPerSharePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 $ 10.75bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingPerSharePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 $ 10.20bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingPerSharePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		            
Granted (in dollars per share) $ 12.55bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeGranted
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 $ 17.25bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeGranted
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 $ 16.50bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeGranted
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		            
Exercised (in dollars per share) $ 10.75bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercised
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 $ 10.75bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercised
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 $ 10.20bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercised
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		            
Canceled (in dollars per share) $ 16.50bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeCanceled
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 $ 15.22bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeCanceled
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 $ 17.61bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeCanceled
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		            
Outstanding, end of period (in dollars per share) $ 11.50bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingPerSharePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 $ 10.75bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingPerSharePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 $ 10.75bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingPerSharePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		            
Exercisable (in dollars per share) $ 11.50bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsPerSharePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 $ 10.75bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsPerSharePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 $ 10.75bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsPerSharePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		            
Maximum [Member]                  
Range of Exercise Prices [Abstract]                  
Outstanding, beginning of period (in dollars per share) $ 21.85bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingPerSharePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 21.85bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingPerSharePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 21.85bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingPerSharePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		            
Granted (in dollars per share) $ 17.80bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeGranted
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 18.95bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeGranted
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 18.39bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeGranted
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		            
Exercised (in dollars per share) $ 10.75bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercised
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 20.02bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercised
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 17.61bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercised
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		            
Canceled (in dollars per share) $ 21.85bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeCanceled
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 20.02bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeCanceled
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 17.61bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeCanceled
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		            
Outstanding, end of period (in dollars per share) $ 21.00bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingPerSharePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 21.85bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingPerSharePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 21.85bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingPerSharePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		            
Exercisable (in dollars per share) $ 21.00bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsPerSharePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 21.85bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsPerSharePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 21.85bdms_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsPerSharePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		            
2005 Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of Common stock shares authorized under the plan (in shares)         1,025,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		 775,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		 625,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		 425,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		 300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member
Shares available for issuance (in shares) 191,701us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		                
Minimum number of plan administrators 2bdms_MinimumNumberOfPlanAdministrators
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		                
Percentage premium for ten percent or greater shareholders (in hundredths) 10.00%bdms_ShareBasedCompensationArrangementByShareBasedPaymentAwardPremiumPriceOfCommonStockForGreaterThanTenPercentShareholdersPercent
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		                
Terms of award 7 years                
Terms of award for ten percent shareholders 5 years                
Threshold percentage for paying a premium for stock options (in hundredths) 10.00%bdms_ShareBasedCompensationArrangementByShareBasedPaymentAwardMinimumPercentageOwnedByShareholdersToBeRequiredToPayPremium
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		                
Vested options (in shares) 322,834us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		                
Unvested options (in shares) 263,999bdms_UnvestedOptionsInShares
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		                
Options, additional disclosures [Abstract]                  
Weighted average grant date fair value of options (in dollars per share) $ 2.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		 $ 4.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		 $ 5.16us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		            
Net cash proceeds from the exercise of stock options 64,500us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		 43,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		 0us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		            
Income tax effect 11,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		 (60,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		 (18,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		            
Intrinsic value 67,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		 165,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		 142,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		            
Total unrecognized compensation expense $ 411,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_PlanNameAxis
= bdms_EquityIncentivePlan2005Member		                
Weighted average period for recognition 2 years 6 months 4 days                
2005 Plan [Member] | Minimum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period 3 years                
2005 Plan [Member] | Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period 5 years                
[1] The expected life, in years, of stock options is estimated based on historical experience.
[2] The risk-free interest rate is based on U.S. Treasury bills whose term is consistent with the expected life of the stock options.
[3] The expected volatility is estimated based on historical and current stock price data for the Company.
[4] Forfeitures are estimated based on historical experience.