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6. Stockholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Beginning Balance, Amount $ 33,233us-gaap_StockholdersEquity  
Beginning Balance, Shares 13,665,087us-gaap_CommonStockSharesOutstanding  
Common stock option exercise and issued, Amount 41RWC_CommonStockOptionExerciseAndIssuedAmount  
Share - based compensation expense 7us-gaap_AllocatedShareBasedCompensationExpense  
Net income 538us-gaap_NetIncomeLoss 475us-gaap_NetIncomeLoss
Ending Balance, Amount 33,819us-gaap_StockholdersEquity  
Ending Balance, Shares 13,690,760us-gaap_CommonStockSharesOutstanding  
CommonStockMember    
Beginning Balance, Amount 8,199us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Beginning Balance, Shares 13,665,087us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Common stock option exercise and issued, Amount 15RWC_CommonStockOptionExerciseAndIssuedAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Common stock option exercise and issued, Shares 25,673RWC_CommonStockOptionExerciseAndIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Share - based compensation expense     
Ending Balance, Amount 8,214us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Ending Balance, Shares 13,690,760us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
AdditionalPaidInCapitalMember    
Beginning Balance, Amount 24,816us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Common stock option exercise and issued, Amount 26RWC_CommonStockOptionExerciseAndIssuedAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Share - based compensation expense 7us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Ending Balance, Amount 24,849us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
AccumulatedDeficitMember    
Beginning Balance, Amount 218us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= RWC_AccumulatedDeficitMember
 
Common stock option exercise and issued, Amount     
Share - based compensation expense     
Net income 538us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= RWC_AccumulatedDeficitMember
 
Ending Balance, Amount $ 756us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= RWC_AccumulatedDeficitMember