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Note 10 - Retirement and Postretirement Plans (Details) - Asset Allocation for Company’s Funded Retirement Plans
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Note 10 - Retirement and Postretirement Plans (Details) - Asset Allocation for Company’s Funded Retirement Plans [Line Items]      
Weighted Average Asset Allocations   100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Equity Securities [Member] | Scenario, Forecast [Member]      
Note 10 - Retirement and Postretirement Plans (Details) - Asset Allocation for Company’s Funded Retirement Plans [Line Items]      
Asset allocation Range 60.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		    
Equity Securities [Member]      
Note 10 - Retirement and Postretirement Plans (Details) - Asset Allocation for Company’s Funded Retirement Plans [Line Items]      
Weighted Average Asset Allocations   59.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember		 71.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
Fixed Income Securities/Cash [Member] | Scenario, Forecast [Member]      
Note 10 - Retirement and Postretirement Plans (Details) - Asset Allocation for Company’s Funded Retirement Plans [Line Items]      
Asset allocation Range 40.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= meg_FixedIncomeSecuritiesCashMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		    
Fixed Income Securities/Cash [Member]      
Note 10 - Retirement and Postretirement Plans (Details) - Asset Allocation for Company’s Funded Retirement Plans [Line Items]      
Weighted Average Asset Allocations   40.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= meg_FixedIncomeSecuritiesCashMember		 29.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= meg_FixedIncomeSecuritiesCashMember
Other Defined Benefit Plan Category [Member]      
Note 10 - Retirement and Postretirement Plans (Details) - Asset Allocation for Company’s Funded Retirement Plans [Line Items]      
Weighted Average Asset Allocations   1.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= meg_OtherDefinedBenefitPlanCategoryMember		 0.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= meg_OtherDefinedBenefitPlanCategoryMember