Note 5 - Fair Value (Details) - Investment Assets and Liabilities Measured at Fair Value on Recurring Basis (USD $) In Thousands, unless otherwise specified	Jun. 29, 2014	Mar. 30, 2014
Assets:
Investment assets fair value		$ 157,056
Liabilities:
Acquisition-related contingent consideration	4,011	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]
Assets:
Investment assets fair value		14,019
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Assets:
Investment assets fair value		4,636
Fair Value, Inputs, Level 2 [Member]
Assets:
Investment assets fair value		143,037
Liabilities:
Acquisition-related contingent consideration	99
Fair Value, Inputs, Level 3 [Member] | Altior [Member]
Liabilities:
Acquisition-related contingent consideration	3,022	2,973
Fair Value, Inputs, Level 3 [Member] | Cadeka [Member]
Liabilities:
Acquisition-related contingent consideration	890	1,370
Fair Value, Inputs, Level 3 [Member]
Liabilities:
Acquisition-related contingent consideration	3,912	4,343
Altior [Member]
Liabilities:
Acquisition-related contingent consideration	3,022	2,973
Cadeka [Member]
Liabilities:
Acquisition-related contingent consideration	890	1,370
Money Market Funds [Member]
Assets:
Investment assets fair value		$ 4,636