CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenue	$ 61,506	$ 54,798	$ 119,358	$ 107,036
Contract costs	48,722	42,941	94,727	84,281
General and administrative costs	6,135	6,260	12,285	12,174
Depreciation and amortization	2,029	1,760	4,091	3,619
Total operating costs	56,886	50,961	111,103	100,074
Income from operations	4,620	3,837	8,255	6,962
Interest expense, net	1,004	906	2,084	1,846
Income before income taxes	3,616	2,931	6,171	5,116
Income tax expense	1,049	855	1,790	1,488
Net income	$ 2,567	$ 2,076	$ 4,381	$ 3,628
Net income per share - basic (in dollars per share)	$ 0.20	$ 0.17	$ 0.35	$ 0.30
Net income per share - diluted (in dollars per share)	$ 0.19	$ 0.16	$ 0.32	$ 0.28
Weighted average common stock outstanding
Basic (in shares)	12,544	12,299	12,521	12,193
Diluted (in shares)	13,570	13,003	13,568	12,886