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Earnings Per Common Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Common Share [Abstract]    
Net earnings available to common shareholders $ 1,318us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 6,678us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Dividends on Series C preferred stock 0us-gaap_ConvertiblePreferredDividendsNetOfTax 100us-gaap_ConvertiblePreferredDividendsNetOfTax
Adjusted net earnings available to common shareholders $ 1,318msl_NetIncomeLossAvailableToCommonStockholdersPlusDividendsOnConvertiblePreferred $ 6,778msl_NetIncomeLossAvailableToCommonStockholdersPlusDividendsOnConvertiblePreferred
Weighted average number of common shares outstanding used in computation of basic earnings per common share (in shares) 11,318,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 11,258,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities [Abstract]    
Stock options (in shares) 29,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 74,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Convertible preferred stock and warrants (in shares) 4,000msl_IncrementalCommonSharesAttributableToConversionOfPreferredStockAndWarrants 547,000msl_IncrementalCommonSharesAttributableToConversionOfPreferredStockAndWarrants
Weighted average number of common shares outstanding plus effect of dilutive securities - used in computation of diluted earnings per common share (in shares) 11,351,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,879,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Stock Options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive shares excluded from computing diluted earnings per share (in shares) 134,822us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
18,003us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
Convertible Preferred Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive shares excluded from computing diluted earnings per share (in shares) 518,086us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertiblePreferredStockMember