Note 5 - Fair Value (Details) - Investment Assets and Liabilities Measured at Fair Value on Recurring Basis (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014
Assets:
Investment assets fair value	$ 157,056
Liabilities:
Acquisition-related contingent consideration	4,343
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Investment assets fair value	9,378
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Investment assets fair value	13,134
US Government Agencies Debt Securities [Member]
Assets:
Investment assets fair value	22,512
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Investment assets fair value	2,772
US States and Political Subdivisions Debt Securities [Member]
Assets:
Investment assets fair value	2,772
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Investment assets fair value	5
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Investment assets fair value	71,248
Corporate Debt Securities [Member]
Assets:
Investment assets fair value	71,253
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Investment assets fair value	27,635
Asset-backed Securities [Member]
Assets:
Investment assets fair value	27,635
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Investment assets fair value	28,248
Collateralized Mortgage Backed Securities [Member]
Assets:
Investment assets fair value	28,248
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Assets:
Investment assets fair value	4,636
Fair Value, Inputs, Level 1 [Member]
Assets:
Investment assets fair value	14,019
Fair Value, Inputs, Level 2 [Member]
Assets:
Investment assets fair value	143,037
Fair Value, Inputs, Level 3 [Member] | Altior [Member]
Liabilities:
Acquisition-related contingent consideration	2,973
Fair Value, Inputs, Level 3 [Member] | Cadeka Microcircuits [Member]
Liabilities:
Acquisition-related contingent consideration	1,370
Fair Value, Inputs, Level 3 [Member]
Liabilities:
Acquisition-related contingent consideration	4,343
Money Market Funds [Member]
Assets:
Investment assets fair value	4,636
Altior [Member]
Liabilities:
Acquisition-related contingent consideration	2,973
Cadeka Microcircuits [Member]
Liabilities:
Acquisition-related contingent consideration	$ 1,370