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Condensed Consolidated Statements Of Income (USD $)
 3 Months Ended 6 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Condensed Consolidated Statements Of Income [Abstract]        
Net sales $ 4,907,000 $ 6,157,000 $ 10,937,000 $ 11,986,000
Cost of sales 3,504,000 3,733,000 7,205,000 7,378,000
Gross profit 1,403,000 2,424,000 3,732,000 4,608,000
Operating expenses:        
Selling expenses 369,000 351,000 743,000 775,000
General and administrative expenses 709,000 897,000 1,544,000 1,660,000
Research and development costs 607,000 605,000 1,269,000 1,196,000
Total operating expenses 1,685,000 1,853,000 3,556,000 3,631,000
Income (loss) from operations (282,000) 571,000 176,000 977,000
Other income (expense):        
Interest expense, net (9,000) (22,000) (20,000) (80,000)
Total other income (expense) (9,000) (22,000) (20,000) (80,000)
Income (loss) before provision for income taxes (291,000) 549,000 156,000 897,000
Provision for income taxes 1,000 148,000 2,000 154,000
Net income (loss) $ (292,000) $ 401,000 $ 154,000 $ 743,000
Net income (loss) per share:        
Basic $ (0.09) $ 0.12 $ 0.05 $ 0.23
Diluted $ (0.09) $ 0.12 $ 0.05 $ 0.23
Weighted average shares outstanding - basic 3,272,350 3,263,437 3,272,350 3,257,643
Weighted average shares outstanding - diluted 3,272,350 3,272,152 3,292,508 3,263,654