CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS
Net revenues	$ 82,063	$ 111,563	$ 154,240	$ 220,016
Cost of sales	73,678	92,267	144,868	181,977
Gross profit	8,385	19,296	9,372	38,039
Selling, general and administrative expense	11,257	10,785	20,990	22,292
Research and technical expense	864	1,028	1,651	1,910
Operating income (loss)	(3,736)	7,483	(13,269)	13,837
Nonoperating retirement benefit expense	359	1,700	718	3,400
Interest income	(1)	(10)	(5)	(24)
Interest expense	298	296	602	547
Income (loss) before income taxes	(4,392)	5,497	(14,584)	9,914
Provision for (benefit from) income taxes	(760)	1,429	(2,925)	2,578
Net income (loss)	$ (3,632)	$ 4,068	$ (11,659)	$ 7,336
Net income (loss) per share:
Basic (in dollars per share)	$ (0.29)	$ 0.32	$ (0.94)	$ 0.58
Diluted (in dollars per share)	$ (0.29)	$ 0.32	$ (0.94)	$ 0.58
Weighted Average Common Shares Outstanding
Weighted average common shares outstanding - Basic	12,514,208	12,473,881	12,503,479	12,466,867
Weighted average common shares outstanding - Diluted	12,514,208	12,504,063	12,503,479	12,496,949
Dividends declared per common share (in dollars per share)	$ 0.22	$ 0.22	$ 0.44	$ 0.44