Note B - Commitments and Facilities (Details Textual) - USD ($)	12 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Nov. 13, 2014
Operating Leases, Rent Expense	$ 630,000	$ 505,000	$ 450,000
Stock Repurchase Program, Authorized Amount				$ 8,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 7,151,000

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

No definition available.

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration