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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 6 Months Ended
Sep. 29, 2012
Sep. 24, 2011
Sep. 29, 2012
Sep. 24, 2011
Total Revenue:        
Net Revenue $ 26,788 $ 25,183 $ 51,885 $ 50,788
Gross Profit:        
Gross Profit 6,078 6,153 12,285 12,451
Operating Income (Loss):        
Operating Income 1,180 1,241 1,774 1,811
Unallocated Amounts:        
Interest and Other Expense, net 51 38 98 83
Provision for Income Taxes 384 457 570 657
Total 435 495 668 740
Net Income 745 746 1,106 1,071
Product Segment [Member]
        
Total Revenue:        
Net Revenue 16,948 16,969 33,313 34,151
Gross Profit:        
Gross Profit 3,723 4,311 7,933 8,579
Operating Expenses:        
Operating Expenses 2,876 [1] 2,854 [1] 6,234 6,301
Operating Income (Loss):        
Operating Income 847 1,457 1,699 2,278
Service Segment [Member]
        
Total Revenue:        
Net Revenue 9,840 8,214 18,572 16,637
Gross Profit:        
Gross Profit 2,355 1,842 4,352 3,872
Operating Expenses:        
Operating Expenses 2,022 [1] 2,058 [1] 4,277 4,339
Operating Income (Loss):        
Operating Income 333 (216) 75 (467)
Total [Member]
        
Total Revenue:        
Net Revenue 26,788 25,183 51,885 50,788
Gross Profit:        
Gross Profit 6,078 6,153 12,285 12,451
Operating Expenses:        
Operating Expenses 4,898 4,912 10,511 10,640
Operating Income (Loss):        
Operating Income $ 1,180 $ 1,241 $ 1,774 $ 1,811
[1] Operating expense allocations between segments were based on actual amounts, a percentage of revenues, headcount, and management's estimates.