Note 7 - Intangible Assets - Summary of Intangible Assets (Details) - USD ($)	Mar. 31, 2018	Sep. 30, 2017
Gross intangibles	$ 24,475,000	$ 24,475,000
Accumulated amortization	(23,227,000)	(21,417,000)
	1,248,000	3,058,000
Customer Relationships [Member]
Gross intangibles	21,950,000	21,950,000
Accumulated amortization	(20,812,000)	(19,174,000)
	1,138,000	2,776,000
Developed Technology Rights [Member]
Gross intangibles	2,525,000	2,525,000
Accumulated amortization	(2,415,000)	(2,243,000)
	$ 110,000	$ 282,000