Note 4 - Segment Information (Details) - Business Segments - Operating Income: Distribution Products ("Products") and Calibration Services ("Service") (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 29, 2013		Jun. 29, 2013	Jun. 30, 2012
Revenue:
Net Revenue	$ 28,710			$ 25,097
Gross Profit:
Gross Profit	7,214			6,207
Operating Expenses:
Operating Expenses	6,062			5,613
Operating Income (Loss):
Operating Income (Loss)	1,152			594
Unallocated Amounts:
Interest and Other Expense, net	4			47
Provision for Income Taxes	427			186
Total	431			233
Net Income	721		721	361
Distribution Sales [Member]
Revenue:
Net Revenue	16,971			16,365
Gross Profit:
Gross Profit	4,018			4,210
Operating Expenses:
Operating Expenses	3,327	[1]		3,358	[1]
Operating Income (Loss):
Operating Income (Loss)	691			852
Service Segment [Member]
Revenue:
Net Revenue	11,739			8,732
Gross Profit:
Gross Profit	3,196			1,997
Operating Expenses:
Operating Expenses	2,735	[1]		2,255	[1]
Operating Income (Loss):
Operating Income (Loss)	461			(258)
Total [Member]
Revenue:
Net Revenue	28,710			25,097
Gross Profit:
Gross Profit	7,214			6,207
Operating Expenses:
Operating Expenses	6,062			5,613
Operating Income (Loss):
Operating Income (Loss)	$ 1,152			$ 594

[1] Operating expense allocations between segments were based on actual amounts, a percentage of revenues, headcount, and management's estimates.