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Accounts Receivable
12 Months Ended
Jun. 30, 2019
Receivables [Abstract]  
Accounts Receivable
4. Accounts Receivable

Accounts receivable as of June 30, 2019 and 2018 consisted of the following (in thousands): 

 

June 30,  2019  2018
       
Accounts receivable - trade  $26,158   $14,761 
Contract receivables   4,722    770 
Retention receivables       728 
    30,880    16,259 
Allowance for doubtful accounts   (323)   (233)
   $30,557   $16,026