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Income Taxes: (Details 4) - USD ($)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Tax credit carryforward
Valuation allowance					$ 1,435,000
Unrecognized tax benefits	$ 526,000	$ 492,000	$ 403,000	$ 615,000	526,000	$ 492,000	$ 403,000
Increase in valuation allowance	3,936,000
Reconciliation of beginning and ending balances of total amounts of gross unrecognized tax benefits
Balance at beginning of year	526,000	492,000	403,000
Unrecognized tax benefits related to prior years		1,500
Unrecognized tax benefits related to current year	125,000	32,500	120,000
Decrease in unrecognized tax benefits due to the lapse of applicable statute of limitations	(36,000)		(31,000)
Balance at end of year	615,000	526,000	492,000
Unrecognized tax benefits , if recognized, would impact effective tax rate				615,000	526,000	$ 492,000
Interest accrued, net of tax benefits				300	$ 1,000
Accrual recorded for penalties				0
Expense (benefit) for interest (net of federal impact) recognized	(2,000)	$ 0	$ (3,000)
Adjustments resulting from IRS examination							$ 0
Other Liabilities
Tax credit carryforward
Unrecognized tax benefits	2,000			2,000
Reconciliation of beginning and ending balances of total amounts of gross unrecognized tax benefits
Balance at end of year	$ 2,000
R&D | Federal
Tax credit carryforward
Tax Credit carryforwards				1,185,000
R&D | State
Tax credit carryforward
Tax Credit carryforwards				$ 288,000

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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