Condensed Consolidated Statements of Operations - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenues, net	$ 19,964,000	$ 23,100,000	$ 73,983,000	$ 60,865,000
Cost of sales	14,064,000	13,021,000	47,025,000	35,546,000
Gross profit	5,900,000	10,079,000	26,958,000	25,319,000
Selling, general and administrative	7,157,000	7,281,000	21,008,000	18,182,000
Research, development and engineering	1,646,000	1,523,000	5,018,000	4,637,000
Gain on sale of fixed assets	(12,465,000)		(12,465,000)
Severance expense		71,000		71,000
Operating income	9,562,000	1,204,000	13,397,000	2,429,000
Interest income (expense) and other, net	680,000	(155,000)	627,000	(337,000)
Income before income tax provision	10,242,000	1,049,000	14,024,000	2,092,000
Income tax provision	20,000	680,000	840,000	1,250,000
Net income	$ 10,222,000	$ 369,000	$ 13,184,000	$ 842,000
Income Per Share:
Net income per basic share	$ 0.74	$ 0.03	$ 0.94	$ 0.06
Net income per diluted share	$ 0.73	$ 0.03	$ 0.93	$ 0.06
Weighted average shares outstanding - basic	13,889	14,176	14,042	14,163
Weighted average shares outstanding - diluted	14,026	14,373	14,220	14,292