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Income Taxes: (Details 2) (USD $)
 1 Months Ended
Dec. 31, 2010
Sep. 30, 2013
Sep. 30, 2012
Income Taxes:      
Extension period of research and development tax credit 2 years    
Current deferred tax assets:      
Reserves and accruals   $ 1,657,601 $ 1,514,711
Research and development credits   349,195 80,000
NOL carryforwards-state   1,600  
Gross current deferred tax assets   2,008,396 1,594,711
Less valuation allowance, current   (5,717) (6,549)
Total net current deferred tax assets   2,002,679 1,588,162
Net current deferred tax asset   2,002,679 1,588,162
Non current deferred tax assets:      
Reserves and accruals   196,312 240,390
Research and development credit   548,952 774,318
NOL carryforwards-state   1,246,615 1,236,554
Stock options   714,040 614,087
Depreciation   (626,063) (576,589)
Other   4,023 6,304
Gross non current deferred tax assets   2,083,879 2,295,064
Less valuation allowance, non current   (1,432,881) (1,448,177)
Total net non current deferred tax assets   650,998 846,887
Non current deferred tax liabilities:      
Depreciation   (132,202) (128,998)
Total non current deferred tax liabilities   (132,202) (128,998)
Net non current deferred tax asset   $ 518,796 $ 717,889