Note 2 - Inventories (Details) - Inventories (USD $) In Thousands, unless otherwise specified	Sep. 29, 2013	Dec. 31, 2012
Inventory [Line Items]
Raw materials	$ 27,592	$ 24,197
Work in process	4,149	3,000
Finished goods	3,803	3,169
Total materials purchased for resale (distribution products), net	21,135	17,451
Total inventories	55,854	46,992
Total manufactured goods, net	34,719	29,541
Materials purchased for resale (distribution products)	21,532	17,732
Manufactured Goods [Member]
Inventory [Line Items]
Less: reserve for inventory obsolescence	(825)	(825)
Purchased Goods [Member]
Inventory [Line Items]
Less: reserve for inventory obsolescence	$ (397)	$ (281)