Note 3 - Inventories (Details) (USD $)	3 Months Ended			3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Mar. 31, 2013 Previously Unrecognized LIFO Income [Member] After-tax [Member]
Note 3 - Inventories (Details) [Line Items]
LIFO Inventory Amount	$ 44,100,000		$ 43,900,000
Percentage of LIFO Inventory	14.20%		15.30%
Inventory, LIFO Reserve, Period Charge	(400,000)	375,000
Inventory, LIFO Reserve, Effect on Income, Net				1,200,000
Inventory Difference Using FIFO Basis	$ 3,200,000		$ 3,600,000