CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenue	$ 61,555	$ 51,459	$ 180,913	$ 158,495
Contract costs	48,365	39,615	143,092	123,895
General and administrative costs	6,237	6,323	18,522	18,497
Depreciation and amortization	2,014	1,721	6,105	5,340
Total operating costs	56,616	47,659	167,719	147,732
Income from operations	4,939	3,800	13,194	10,763
Interest expense, net	893	813	2,977	2,659
Income before income taxes	4,046	2,987	10,217	8,104
Income tax expense	1,166	863	2,956	2,352
Net income	$ 2,880	$ 2,124	$ 7,261	$ 5,752
Net income per share - basic (in dollars per share)	$ 0.23	$ 0.17	$ 0.58	$ 0.47
Net income per share - diluted (in dollars per share)	$ 0.21	$ 0.16	$ 0.54	$ 0.44
Weighted average common stock outstanding
Basic (in shares)	12,545	12,354	12,529	12,246
Diluted (in shares)	13,655	13,228	13,694	13,050