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Note 9 - Business Segment Information (Details) - Net Sales from External Customers by Product Category (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Sales Revenue, Net | $ 434,925 us-gaap_SalesRevenueNet | $ 391,665 us-gaap_SalesRevenueNet | $ 375,691 us-gaap_SalesRevenueNet
Pumps And Pump Systems [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales Revenue, Net | 379,626 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = grc_PumpsAndPumpSystemsMember | 336,779 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = grc_PumpsAndPumpSystemsMember | 318,235 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = grc_PumpsAndPumpSystemsMember
Repairs And Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales Revenue, Net | $ 55,299 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = grc_RepairsAndOtherMember | $ 54,886 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = grc_RepairsAndOtherMember | $ 57,456 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = grc_RepairsAndOtherMember

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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Data Type: | xbrli:stringItemType
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Data Type: | na
Balance Type: |
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