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Note C - Inventories, net (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Note C - Inventories Net Details    
Purchased parts and components $ 1,110,000 $ 1,245,000
Work in process and purchased assemblies 1,496,000 1,631,000
Finished goods 640,000 739,000
Net $ 3,246,000 $ 3,615,000