Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Current Assets:
Cash and cash equivalents	$ 108,675	$ 160,216
Short-term investments	20,165	18,705
Accounts receivable, less allowance for credit losses of $545 and $510	72,369	69,957
Contract assets	50,827	50,995
Inventories	28,397	28,968
Income taxes receivable	172	467
Prepaid expenses	3,190	4,402
Other current assets	1,739	1,948
Total Current Assets	285,534	335,658
Property, plant and equipment, net	112,485	114,372
Operating lease assets, net	3,732	5,217
Goodwill and intangible assets, net	1,028	1,161
Deferred income taxes	4,230	3,644
Other assets	14,952	12,226
Total Assets	421,961	472,278
Current Liabilities:
Current maturities of long-term debt	400	400
Accounts payable	33,416	35,029
Contract liabilities	43,140	79,445
Accrued compensation and benefits	16,379	21,739
Accrued product warranty	2,432	2,771
Current operating lease liabilities	1,640	2,352
Income taxes payable	54	1,861
Other current liabilities	7,849	9,350
Total Current Liabilities	105,310	152,947
Long-term debt, net of current maturities	0	400
Deferred compensation	8,793	6,710
Long-term operating lease liabilities	2,554	3,434
Other long-term liabilities	2,363	2,161
Total Liabilities	119,020	165,652
Commitments and Contingencies (Note F)
Stockholders' Equity:
Preferred stock, par value $0.01; 5,000,000 shares authorized; none issued	0	0
Common stock, par value $0.01; 30,000,000 shares authorized; 12,497,691 and 12,422,411 shares issued, respectively	125	124
Additional paid-in capital	63,500	61,998
Retained earnings	282,284	294,016
Treasury stock, 806,018 shares at cost	(24,999)	(24,999)
Accumulated other comprehensive loss	(17,969)	(24,513)
Total Stockholders' Equity	302,941	306,626
Total Liabilities and Stockholders' Equity	$ 421,961	$ 472,278