Note 3 - Fair Value Measurements (Details) - Assets and liabilities measured at fair value on a recurring basis (USD $) In Thousands, unless otherwise specified	Sep. 29, 2013	Mar. 31, 2013
Note 3 - Fair Value Measurements (Details) - Assets and liabilities measured at fair value on a recurring basis [Line Items]
Marketable securities	$ 11,055	$ 12,307
Fair Value, Inputs, Level 2 [Member]
Note 3 - Fair Value Measurements (Details) - Assets and liabilities measured at fair value on a recurring basis [Line Items]
Marketable securities	$ 11,055	$ 12,307