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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 6 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Sep. 28, 2013
Sep. 29, 2012
Total Revenue:        
Net Revenue $ 28,882 $ 26,788 $ 57,592 $ 51,885
Gross Profit:        
Gross Profit 6,821 6,078 14,035 12,285
Operating Expenses:        
Operating Expenses 5,540 4,898 11,602 10,511
Operating Income:        
Operating Income (Loss) 1,281 1,180 2,433 1,774
Unallocated Amounts:        
Interest and Other Expense, net 68 51 72 98
Provision for Income Taxes 442 384 869 570
Total 510 435 941 668
Net Income 771 745 1,492 1,106
Distribution Sales [Member]
        
Total Revenue:        
Net Revenue 17,410 16,948 34,381 33,313
Gross Profit:        
Gross Profit 4,113 3,723 8,131 7,933
Operating Expenses:        
Operating Expenses 3,092 [1] 2,876 [1] 6,419 [1] 6,234 [1]
Operating Income:        
Operating Income (Loss) 1,021 847 1,712 1,699
Service Segment [Member]
        
Total Revenue:        
Net Revenue 11,472 9,840 23,211 18,572
Gross Profit:        
Gross Profit 2,708 2,355 5,904 4,352
Operating Expenses:        
Operating Expenses 2,448 [1] 2,022 [1] 5,183 [1] 4,277 [1]
Operating Income:        
Operating Income (Loss) 260 333 721 75
Total [Member]
        
Total Revenue:        
Net Revenue 28,882 26,788 57,592 51,885
Gross Profit:        
Gross Profit 6,821 6,078 14,035 12,285
Operating Expenses:        
Operating Expenses 5,540 4,898 11,602 10,511
Operating Income:        
Operating Income (Loss) $ 1,281 $ 1,180 $ 2,433 $ 1,774
[1] Operating expense allocations between segments were based on actual amounts, a percentage of revenues, headcount, and management's estimates.