Note 3 - Inventories (Details) (USD $)	3 Months Ended			3 Months Ended
	Sep. 30, 2014	Sep. 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	$ 46,400,000		$ 43,900,000
Percentage of LIFO Inventory	14.10%		15.30%
Inventory, LIFO Reserve, Period Charge	(200,000)	188,000
Inventory, LIFO Reserve, Effect on Income, Net				1,200,000
Inventory Difference Using FIFO Basis	$ 3,000,000		$ 3,600,000