Note 2 - Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($)	Sep. 30, 2018	Sep. 30, 2017
Gross intangible	$ 24,475,000	$ 24,475,000
Accumulated amortization	(24,475,000)	(21,417,000)
		3,058,000
Customer Relationships [Member]
Gross intangible	21,950,000	21,950,000
Accumulated amortization	(21,950,000)	(19,174,000)
	0	2,776,000
Developed Technology Rights [Member]
Gross intangible	2,525,000	2,525,000
Accumulated amortization	(2,525,000)	(2,243,000)
	$ 0	$ 282,000