Note 3 - Inventories (Details) (USD $)	3 Months Ended		3 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Mar. 31, 2013 Previously Unrecognized LIFO Income [Member] Pre-Tax Amounts [Member]	Mar. 31, 2013 Pre-Tax Amounts [Member]
Note 3 - Inventories (Details) [Line Items]
LIFO Inventory Amount	$ 44,900,000	$ 46,700,000
Percentage of LIFO Inventory	18.10%	16.10%
Inventory, LIFO Reserve, Effect on Income, Net			(1,900,000)	(1,200,000)
Inventory, LIFO Reserve, Period Charge	375,000
Inventory Difference Using FIFO Basis	$ 2,300,000