Note 5 - Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Gross Amount	$ 14,697	$ 11,877
Accumulated Amortization	(4,721)	(3,964)
Net Book Value	9,976	7,913
Customer Relationships [Member]
Gross Amount	9,070	6,500
Accumulated Amortization	(1,445)	(1,018)
Net Book Value	7,625	5,482
Technology-Based Intangible Assets [Member]
Gross Amount	1,800	1,800
Accumulated Amortization	(349)	(283)
Net Book Value	1,451	1,517
Noncompete Agreements [Member]
Gross Amount	3,687	3,577
Accumulated Amortization	(2,904)	(2,663)
Net Book Value	783	$ 914
Trade Names [Member]
Gross Amount	140
Accumulated Amortization	(23)
Net Book Value	$ 117