Annual report pursuant to Section 13 and 15(d)

Segment Information (Details Textual)

v2.4.1.9
Segment Information (Details Textual)
12 Months Ended
Mar. 31, 2015
Segment Reporting Information [Line Items]  
Concentration Risk, Percentage 10.00%us-gaap_ConcentrationRiskPercentage1
Sales Revenue, Net [Member] | UNITED STATES  
Segment Reporting Information [Line Items]  
Concentration Risk, Percentage 90.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_StatementGeographicalAxis
= country_US
longlivedassets [Member] | UNITED STATES  
Segment Reporting Information [Line Items]  
Concentration Risk, Percentage 90.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= wstl_LonglivedassetsMember
/ us-gaap_StatementGeographicalAxis
= country_US