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Note 4 - Segment Information (Detail) - Business Segments - Operating Income: Distribution Products ("Products") and Calibration Services ("Service"): (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 29, 2012
Dec. 24, 2011
Dec. 29, 2012
Dec. 24, 2011
Total Revenue:        
Net Revenue $ 29,324 $ 28,460 $ 81,209 $ 79,248
Gross Profit:        
Gross Profit 6,630 6,788 18,915 19,239
Operating Income (Loss):        
Operating Income 1,221 1,653 2,995 3,464
Unallocated Amounts:        
Interest and Other Expense, net 37 44 135 127
Provision for Income Taxes 402 585 972 1,242
Total 439 629 1,107 1,369
Net Income 782 1,024 1,888 2,095
Product Segment [Member]
        
Total Revenue:        
Net Revenue 19,440 19,382 52,753 53,533
Gross Profit:        
Gross Profit 4,503 4,962 12,436 13,541
Operating Expenses:        
Operating Expenses 3,263 [1] 3,108 [1] 9,497 9,409
Operating Income (Loss):        
Operating Income 1,240 1,854 2,939 4,132
Service Segment [Member]
        
Total Revenue:        
Net Revenue 9,884 9,078 28,456 25,715
Gross Profit:        
Gross Profit 2,127 1,826 6,479 5,698
Operating Expenses:        
Operating Expenses 2,146 [1] 2,027 [1] 6,423 6,366
Operating Income (Loss):        
Operating Income (19) (201) 56 (668)
Total [Member]
        
Total Revenue:        
Net Revenue 29,324 28,460 81,209 79,248
Gross Profit:        
Gross Profit 6,630 6,788 18,915 19,239
Operating Expenses:        
Operating Expenses 5,409 5,135 15,920 15,775
Operating Income (Loss):        
Operating Income $ 1,221 $ 1,653 $ 2,995 $ 3,464
[1] Operating expense allocations between segments were based on actual amounts, a percentage of revenues, headcount, and management's estimates.