Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

v2.4.1.9
Commitments and Contingencies (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Commitments and Contingencies (Textual)      
Environmental remediation obligation 424,596nwmh_EnvironmentalRemediationObligation   $ 424,596nwmh_EnvironmentalRemediationObligation
Secured letter of credit 324,950nwmh_SecuredLetterOfCredit   $ 324,950nwmh_SecuredLetterOfCredit
Sales Revenue, Net [Member]      
Commitments and Contingencies (Textual)      
Percentage of revenues generated from related party 26.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
28.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
 
Accounts Receivable [Member]      
Commitments and Contingencies (Textual)      
Percentage of revenues generated from related party 43.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
36.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember