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Condensed Consolidated Statements of Operations and Retained Earnings (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Income Statement [Abstract] |  |  |  |
Net sales | $ 33,646 us-gaap_SalesRevenueNet | $ 23,385 us-gaap_SalesRevenueNet | $ 97,714 us-gaap_SalesRevenueNet | $ 76,131 us-gaap_SalesRevenueNet
Cost of products sold | 23,543 us-gaap_CostOfGoodsSold | 17,295 us-gaap_CostOfGoodsSold | 68,695 us-gaap_CostOfGoodsSold | 51,737 us-gaap_CostOfGoodsSold
Gross profit | 10,103 us-gaap_GrossProfit | 6,090 us-gaap_GrossProfit | 29,019 us-gaap_GrossProfit | 24,394 us-gaap_GrossProfit
Other expenses and income: |  |  |  |
Selling, general and administrative | 4,424 us-gaap_SellingGeneralAndAdministrativeExpense | 4,047 us-gaap_SellingGeneralAndAdministrativeExpense | 13,413 us-gaap_SellingGeneralAndAdministrativeExpense | 12,786 us-gaap_SellingGeneralAndAdministrativeExpense
Selling, general and administrative - amortization | 59 us-gaap_AmortizationOfIntangibleAssets | 55 us-gaap_AmortizationOfIntangibleAssets | 171 us-gaap_AmortizationOfIntangibleAssets | 168 us-gaap_AmortizationOfIntangibleAssets
Interest income | (50)us-gaap_InvestmentIncomeInterest | (10)us-gaap_InvestmentIncomeInterest | (139)us-gaap_InvestmentIncomeInterest | (31)us-gaap_InvestmentIncomeInterest
Interest expense | 2 us-gaap_InterestIncomeExpenseNonoperatingNet | (11)us-gaap_InterestIncomeExpenseNonoperatingNet | 8 us-gaap_InterestIncomeExpenseNonoperatingNet | (2)us-gaap_InterestIncomeExpenseNonoperatingNet
Total other expenses and income | 4,435 ghm_OtherExpensesAndIncome | 4,081 ghm_OtherExpensesAndIncome | 13,453 ghm_OtherExpensesAndIncome | 12,921 ghm_OtherExpensesAndIncome
Income before provision for income taxes | 5,668 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 2,009 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 15,566 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 11,473 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes | 1,676 us-gaap_IncomeTaxExpenseBenefit | 578 us-gaap_IncomeTaxExpenseBenefit | 4,996 us-gaap_IncomeTaxExpenseBenefit | 3,645 us-gaap_IncomeTaxExpenseBenefit
Net income | 3,992 us-gaap_NetIncomeLoss | 1,431 us-gaap_NetIncomeLoss | 10,570 us-gaap_NetIncomeLoss | 7,828 us-gaap_NetIncomeLoss
Retained earnings at beginning of period | 99,237 us-gaap_RetainedEarningsAccumulatedDeficit | 90,426 us-gaap_RetainedEarningsAccumulatedDeficit | 93,469 us-gaap_RetainedEarningsAccumulatedDeficit | 84,632 us-gaap_RetainedEarningsAccumulatedDeficit
Dividends | (405)us-gaap_DividendsCommonStockCash | (302)us-gaap_DividendsCommonStockCash | (1,215)us-gaap_DividendsCommonStockCash | (905)us-gaap_DividendsCommonStockCash
Retained earnings at end of period | $ 102,824 us-gaap_RetainedEarningsAccumulatedDeficit | $ 91,555 us-gaap_RetainedEarningsAccumulatedDeficit | $ 102,824 us-gaap_RetainedEarningsAccumulatedDeficit | $ 91,555 us-gaap_RetainedEarningsAccumulatedDeficit
Basic: |  |  |  |
Net income | $ 0.39 us-gaap_EarningsPerShareBasic | $ 0.14 us-gaap_EarningsPerShareBasic | $ 1.04 us-gaap_EarningsPerShareBasic | $ 0.78 us-gaap_EarningsPerShareBasic
Diluted: |  |  |  |
Net income | $ 0.39 us-gaap_EarningsPerShareDiluted | $ 0.14 us-gaap_EarningsPerShareDiluted | $ 1.04 us-gaap_EarningsPerShareDiluted | $ 0.78 us-gaap_EarningsPerShareDiluted
Weighted average common shares outstanding: |  |  |  |
Basic: | 10,127 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 10,070 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 10,119 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 10,063 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted: | 10,149 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 10,107 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 10,142 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 10,099 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Dividends declared per share | $ 0.04 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.03 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.12 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.09 us-gaap_CommonStockDividendsPerShareDeclared

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