Consolidated Condensed Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales	$ 30,537	$ 27,392	$ 56,744	$ 56,458
Cost of goods sold	24,260	25,304	47,143	51,633
Gross profit	6,277	2,088	9,601	4,825
Selling, general and administrative expenses	3,321	3,784	7,529	7,894
Amortization of intangible assets	408	413	817	828
Loss (gain) on disposal or impairment of operating assets	41	0	41	(282)
Gain on insurance proceeds received	(1,000)	(1,164)	(1,000)	(1,164)
Operating income (loss)	3,507	(945)	2,214	(2,451)
Interest income	0	(1)	0	(2)
Interest expense	262	315	513	607
Foreign currency exchange gain (loss), net	(1)	(1)	0	(1)
Other loss (income), net	25	(34)	(84)	(35)
Income (loss) before income tax benefit	3,221	(1,224)	1,785	(3,020)
Income tax (benefit) expense	(39)	34	(134)	(480)
Net income (loss)	$ 3,260	$ (1,258)	$ 1,919	$ (2,540)
Net income (loss) per share
Basic (in dollars per share)	$ 0.57	$ (0.23)	$ 0.34	$ (0.46)
Diluted (in dollars per share)	$ 0.57	$ (0.23)	$ 0.33	$ (0.46)
Weighted-average number of common shares (basic) (in shares)	5,679	5,561	5,645	5,548
Weighted-average number of common shares (diluted) (in shares)	5,770	5,561	5,748	5,548