Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2020
Segment Reporting Information [Line Items]
Total sales	$ 17,017	$ 12,022	$ 42,433	$ 37,943
Total gross profit (loss)	4,269	4,171	11,079	7,324
Total gain (loss) from operations	(2,101)	(1,142)	(7,062)	$ (17,584)
Total assets	28,998		$ 28,998		$ 32,503
Operating segments
Segment Reporting Information [Line Items]
Total gross profit (loss)	$ 4,269	$ 4,171
Total gross profit margin (loss)	25.00%	35.00%	26.00%	19.00%
Non-allocated
Segment Reporting Information [Line Items]
Total assets	$ 6,664		$ 6,664		14,881
Wireless | Operating segments
Segment Reporting Information [Line Items]
Total sales	4,136	$ 5,123	13,716	$ 16,593
Total gross profit (loss)	$ 1,233	$ 2,251	$ 4,370	$ 4,299
Total gross profit margin (loss)	30.00%	44.00%	32.00%	26.00%
Total gain (loss) from operations	$ (2,117)	$ (75)	$ (4,759)	$ (3,310)
Total assets	5,645		5,645		5,324
Telco | Operating segments
Segment Reporting Information [Line Items]
Total sales	12,881	6,899	28,717	21,350
Total gross profit (loss)	$ 3,036	$ 1,920	$ 6,710	$ 3,025
Total gross profit margin (loss)	24.00%	28.00%	23.00%	14.00%
Total gain (loss) from operations	$ 16	$ (1,067)	$ (2,303)	$ (14,274)
Total assets	$ 16,689		$ 16,689		$ 12,298