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Note 1 - Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accounting Policies [Abstract] |  |  |
Percentage of LIFO Inventory | 75.00%us-gaap_PercentageOfLIFOInventory | 76.00%us-gaap_PercentageOfLIFOInventory |
Depreciation | $ 13.2 us-gaap_Depreciation | $ 12.4 us-gaap_Depreciation | $ 11.2 us-gaap_Depreciation
Advertising Expense | $ 3.5 us-gaap_AdvertisingExpense | $ 3.4 us-gaap_AdvertisingExpense | $ 3.5 us-gaap_AdvertisingExpense

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- Details
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Data Type: | xbrli:stringItemType
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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Balance Type: | debit
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- Definition The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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