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Accounts Receivable (Tables)
3 Months Ended
Oct. 31, 2022
Receivables [Abstract]  
Accounts receivable
Accounts receivable consist of the following at:
 October 31, 2022July 31, 2022
Receivables from commercial and international customers$58,863,000 59,922,000 
Unbilled receivables from commercial and international customers45,109,000 39,826,000 
Receivables from the U.S. government and its agencies22,427,000 24,776,000 
Unbilled receivables from the U.S. government and its agencies4,948,000 1,524,000 
Total accounts receivable131,347,000 126,048,000 
Less allowance for doubtful accounts2,560,000 2,337,000 
Accounts receivable, net$128,787,000 123,711,000