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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
Jun. 30, 2012
Jun. 25, 2011
Net Revenue:    
Net Revenue $ 25,097 $ 25,605
Gross Profit:    
Gross Profit 6,207 6,298
Operating Expenses:    
Operating Income 594 570
Unallocated Amounts:    
Interest and Other Expense, net 47 45
Provision for Income Taxes 186 200
Total 233 245
Net Income 361 325
Product Segment [Member]
    
Net Revenue:    
Net Revenue 16,365 17,182
Gross Profit:    
Gross Profit 4,210 4,268
Operating Expenses:    
Operating Expenses 3,358 [1] 3,447 [1]
Service Segment [Member]
    
Net Revenue:    
Net Revenue 8,732 8,423
Gross Profit:    
Gross Profit 1,997 2,030
Operating Expenses:    
Operating Expenses 2,255 [1] 2,281 [1]
Total [Member]
    
Net Revenue:    
Net Revenue 25,097 25,605
Gross Profit:    
Gross Profit 6,207 6,298
Operating Expenses:    
Operating Expenses $ 5,613 $ 5,728
[1] Operating expense allocations between segments were based on actual amounts, a percentage of revenues, headcount, and management's estimates.