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Segment Information (Details)
 3 Months Ended 6 Months Ended 9 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2024
USD ($)
segment
Mar. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
Segment Reporting Information [Line Items]              
Number of reportable segments | segment         3    
Revenue $ 166,013,000 $ 186,895,000     $ 538,714,000 $ 589,166,000  
Cost of Revenue (160,435,000) (182,476,000)     (510,688,000) (573,041,000)  
Gross profit (loss) 5,578,000 4,419,000     28,026,000 16,125,000  
Selling, general and administrative expenses 19,948,000 16,862,000     52,792,000 51,218,000  
Goodwill impairment 0 0 $ 12,300,000 $ 12,300,000 0 12,316,000  
Restructuring Costs   316,000       2,881,000  
Operating income (loss) (14,370,000) (12,759,000)     (24,766,000) (50,290,000)  
Segment assets 440,005,000       440,005,000   $ 400,504,000
Storage and Terminal Solutions              
Segment Reporting Information [Line Items]              
Revenue 54,304,000 52,165,000     206,808,000 191,614,000  
Cost of Revenue 51,991,000 52,975,000     197,704,000 183,211,000  
Gross profit (loss) 2,313,000 (810,000)     9,104,000 8,403,000  
Selling, general and administrative expenses 5,395,000 5,735,000     14,362,000 15,342,000  
Goodwill impairment           0  
Restructuring Costs   79,000       984,000  
Operating income (loss) (3,082,000) $ (6,624,000)     (5,258,000) $ (7,923,000)  
Segment assets $ 142,168,000       $ 142,168,000   139,333,000
Storage and Terminal Solutions | Intersegment Eliminations              
Segment Reporting Information [Line Items]              
Segment Information (1) Total revenues are net of inter-segment revenues which are primarily Storage and Terminal Solutions and were $1.3 million for the three months ended March 31, 2024. (1) Total revenues are net of inter-segment revenues which are primarily Storage and Terminal Solutions and were $1.7 million for the three months ended March 31, 2023.     (1) Total revenues are net of inter-segment revenues which are primarily Storage and Terminal Solutions and were $3.1 million for the nine months ended March 31, 2024. (1) Total revenues are net of inter-segment revenues which are primarily Storage and Terminal Solutions and were $2.8 million for the nine months ended March 31, 2023.  
Utility and Power Infrastructure              
Segment Reporting Information [Line Items]              
Revenue $ 46,120,000 $ 35,024,000     $ 118,659,000 $ 130,429,000  
Cost of Revenue 44,711,000 32,234,000     112,139,000 123,500,000  
Gross profit (loss) 1,409,000 2,790,000     6,520,000 6,929,000  
Selling, general and administrative expenses 2,733,000 1,869,000     6,259,000 5,394,000  
Goodwill impairment           0  
Restructuring Costs   0       37,000  
Operating income (loss) (1,324,000) 921,000     261,000 1,498,000  
Segment assets 77,054,000       77,054,000   67,630,000
Process and Industrial Facilities              
Segment Reporting Information [Line Items]              
Revenue 65,589,000 99,706,000     212,014,000 267,123,000  
Cost of Revenue 63,822,000 96,546,000     198,498,000 264,764,000  
Gross profit (loss) 1,767,000 3,160,000     13,516,000 2,359,000  
Selling, general and administrative expenses 2,590,000 3,556,000     7,884,000 11,308,000  
Goodwill impairment           12,316,000  
Restructuring Costs   106,000       803,000  
Operating income (loss) (823,000) (502,000)     5,632,000 (22,068,000)  
Segment assets 118,412,000       118,412,000   90,514,000
Corporate Segment              
Segment Reporting Information [Line Items]              
Revenue 0 0     1,233,000 0  
Cost of Revenue (89,000) 721,000     2,347,000 1,566,000  
Gross profit (loss) 89,000 (721,000)     (1,114,000) (1,566,000)  
Selling, general and administrative expenses 9,230,000 5,702,000     24,287,000 19,174,000  
Goodwill impairment           0  
Restructuring Costs   131,000       1,057,000  
Segment assets 102,371,000       102,371,000   $ 103,027,000
Corporate              
Segment Reporting Information [Line Items]              
Operating income (loss) $ (9,141,000) $ (6,554,000)     $ (25,401,000) $ (21,797,000)