Note 2 - Inventories (Details) - Inventories (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Inventory [Line Items]
Raw materials	$ 26,509	$ 24,197
Work in process	4,339	3,000
Finished goods	4,528	3,169
Total materials purchased for resale (distribution products), net	17,110	17,451
Total inventories	51,674	46,992
Total manufactured goods, net	34,564	29,541
Materials purchased for resale (distribution products)	17,447	17,732
Manufactured Goods [Member]
Inventory [Line Items]
Less: reserve for inventory obsolescence	(812)	(825)
Purchased Goods [Member]
Inventory [Line Items]
Less: reserve for inventory obsolescence	$ (337)	$ (281)