Consolidated Condensed Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net sales	$ 24,866	$ 30,537	$ 49,944	$ 56,744
Cost of goods sold	22,123	24,260	43,278	47,143
Gross profit	2,743	6,277	6,666	9,601
Selling, general and administrative expenses	3,596	3,321	7,423	7,529
Amortization of intangible assets	248	408	517	817
Loss on disposal of operating assets	0	41	0	41
Gain on insurance recoveries	0	(1,000)	(2,495)	(1,000)
Operating income (loss)	(1,101)	3,507	1,221	2,214
Interest expense	169	262	335	513
Foreign currency exchange loss (income), net	14	(1)	21	0
Other loss (income), net	42	25	103	(84)
Income (loss) before income tax expense (benefit)	(1,326)	3,221	762	1,785
Income tax expense (benefit)	165	(39)	(740)	(134)
Net income (loss)	$ (1,491)	$ 3,260	$ 1,502	$ 1,919
Net income (loss) per share
Basic (in dollars per share)	$ (0.26)	$ 0.57	$ 0.26	$ 0.34
Diluted (in dollars per share)	$ (0.26)	$ 0.57	$ 0.25	$ 0.33
Weighted-average number of common shares (basic) (in shares)	5,777	5,679	5,735	5,645
Weighted-average number of common shares (diluted) (in shares)	5,777	5,770	5,932	5,748