CONSOLIDATED INCOME STATEMENTS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 182,714	$ 156,981
Cost of sales	158,594	135,337
Gross profit	24,120	21,644
Selling and administrative expenses	13,986	14,076
Operating profit	10,134	7,568
Interest expense	1,438	1,645
Income before income taxes	8,696	5,923
Provision for income taxes	1,943	1,176
Net income	$ 6,753	$ 4,747
Net income per common share:
Net earnings/loss (in dollars per share)	$ 0.65	$ 0.46
Net earnings/loss (in dollars per share)	$ 0.63	$ 0.45
Weighted average number of shares outstanding:
Weighted Average Number of Shares Outstanding, Basic	10,417,445	10,306,947
Diluted (in shares)	10,727,438	10,518,126