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Note 1 - Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
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 $ 13.2us-gaap_Depreciation $ 12.4us-gaap_Depreciation $ 11.2us-gaap_Depreciation
Advertising Expense $ 3.5us-gaap_AdvertisingExpense $ 3.4us-gaap_AdvertisingExpense $ 3.5us-gaap_AdvertisingExpense