Income Taxes: (Details 2) (USD $)	1 Months Ended
	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011
Income Taxes:
Extension period of research and development tax credit	2 years
Current deferred tax assets:
Deferred revenue			$ 3,058
Reserves and accruals		1,514,711	1,677,183
Research and development credits		80,000	80,000
Gross current deferred tax assets		1,594,711	1,760,241
Less: Valuation allowance , current		(6,549)	(1,307,517)
Total current deferred tax assets		1,588,162	452,724
Current deferred tax liabilities:
Other			(14,089)
Total current deferred tax liabilities			(14,089)
Net current deferred tax asset (liability)		1,588,162	438,635
Non current deferred tax assets:
Reserves and accruals		240,390	238,179
Research and development credit		774,318	848,669
NOL carryforwards-state		1,236,554	1,226,649
Stock options		614,087	503,978
Other		6,304	12,973
Gross non current deferred tax assets		2,871,653	2,830,448
Less: Valuation allowance, non current		(1,448,177)	(2,696,113)
Total non current deferred tax assets		1,423,476	134,335
Non current deferred tax liabilities:
Depreciation		(705,587)	(701,298)
Total non current deferred tax liabilities		(705,587)	(701,298)
Net non current deferred tax asset (liability)		$ 717,889	$ (566,963)