Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Jun. 30, 2021
Current assets:
Cash and cash equivalents (Note 1)	$ 34,092	$ 83,878
Accounts receivable, less allowances (March 31, 2022—$634 and June 30, 2021—$898)	137,690	148,030
Costs and estimated earnings in excess of billings on uncompleted contracts	46,393	30,774
Inventories	6,907	7,342
Income taxes receivable	13,734	16,965
Other current assets	7,322	4,230
Total current assets	246,138	291,219
Property, plant and equipment at cost:
Land and buildings	41,745	41,633
Construction equipment	93,862	94,453
Transportation equipment	49,532	50,510
Office equipment and software	43,447	42,706
Construction in progress	564	493
Total property, plant and equipment - at cost	229,150	229,795
Accumulated depreciation	(168,672)	(160,388)
Property, plant and equipment - net	60,478	69,407
Restricted Cash	25,000	0
Operating lease right-of-use assets	20,811	22,412
Goodwill	42,240	60,636
Other intangible assets, net of accumulated amortization	5,228	6,614
Deferred income taxes	0	5,295
Other assets, non-current	13,185	11,973
Total assets	413,080	467,556
Current liabilities:
Accounts payable	68,161	60,920
Billings on uncompleted contracts in excess of costs and estimated earnings	73,868	53,832
Accrued wages and benefits	23,073	21,008
Accrued insurance	6,310	6,568
Operating lease liabilities	4,928	5,747
Other accrued expenses	3,841	5,327
Total current liabilities	180,181	153,402
Deferred income taxes	32	34
Operating lease liabilities	19,630	20,771
Other liabilities, non-current	401	7,810
Total liabilities	200,244	182,017
Commitments and contingencies
Stockholders' equity:
Common stock—$.01 par value; 60,000,000 shares authorized; 27,888,217 shares issued as of March 31, 2022 and June 30, 2021; 26,783,265 and 26,549,438 shares outstanding as of March 31, 2022 and June 30, 2021, respectively	279	279
Additional paid-in capital	137,886	137,575
Retained earnings	97,822	175,178
Accumulated other comprehensive loss	(7,477)	(6,749)
Stockholders' equity	228,510	306,283
Less: Treasury stock, at cost — 1,104,952 shares as of March 31, 2022, and 1,338,779 shares as of June 30, 2021	(15,674)	(20,744)
Total stockholders' equity	212,836	285,539
Total liabilities and stockholders’ equity	$ 413,080	$ 467,556