Basis of Presentation - Revision of Prior Period Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Sales:
Total sales	$ 11,388	$ 16,858
Cost of sales:
Total cost of sales	8,010	12,827
Gross profit	3,378	4,031
Operating loss	(537)	(402)
Net income (loss)	$ 1,151	$ (540)
Net income (loss) per share – basic	$ 0.27	$ (0.14)
Net income (loss) per share – diluted	$ 0.26	$ (0.14)
Product
Sales:
Total sales	$ 8,408	$ 13,559
Cost of sales:
Total cost of sales	6,949	11,604
Service
Sales:
Total sales	2,980	3,299
Cost of sales:
Total cost of sales	$ 1,061	1,223
As Reported
Sales:
Total sales		16,572
Cost of sales:
Total cost of sales		12,541
Gross profit		4,031
Operating loss		(402)
Net income (loss)		$ (540)
Net income (loss) per share – basic		$ (0.14)
Net income (loss) per share – diluted		$ (0.14)
As Reported | Product
Sales:
Total sales		$ 13,222
Cost of sales:
Total cost of sales		11,318
As Reported | Service
Sales:
Total sales		3,350
Cost of sales:
Total cost of sales		1,223
Restatement Adjustment
Sales:
Total sales		286
Cost of sales:
Total cost of sales		286
Restatement Adjustment | Product
Sales:
Total sales		337
Cost of sales:
Total cost of sales		286
Restatement Adjustment | Service
Sales:
Total sales		$ (51)