CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Current Assets:
Cash and cash equivalents	$ 160,216	$ 118,639
Short-term investments	18,705	6,042
Accounts receivable, less allowance for doubtful accounts of $510 and $301	69,957	112,093
Contract assets	50,995	55,374
Inventories	28,968	29,202
Income taxes receivable	467	233
Prepaid expenses	4,402	4,335
Other current assets	1,948	2,650
Total Current Assets	335,658	328,568
Property, plant and equipment, net	114,372	120,812
Operating lease assets, net	5,217
Goodwill and intangible assets, net	1,161	1,337
Other assets	3,644	5,117
Deferred income taxes	12,226	11,577
Total Assets	472,278	467,411
Current Liabilities:
Current maturities of long-term debt	400	400
Accounts payable	35,029	51,180
Contract liabilities	79,445	71,464
Accrued compensation and benefits	21,739	20,182
Accrued product warranty	2,771	2,946
Current operating lease liabilities	2,352
Income taxes payable	1,861	913
Other current liabilities	9,350	10,811
Total Current Liabilities	152,947	157,896
Long-term debt, net of current maturities	400	800
Deferred compensation (Note J)	6,710	6,447
Long-term operating lease liabilities	3,434
Other long-term liabilities	2,161	3,115
Total Liabilities	165,652	168,258
Commitments and Contingencies (Note H)
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; 12,422,411 and 12,372,766 shares issued, respectively	124	124
Additional paid-in capital	61,998	59,153
Retained earnings	294,016	289,422
Treasury stock, 806,018 shares at cost	(24,999)	(24,999)
Accumulated other comprehensive loss	(24,513)	(24,547)
Total Stockholders' Equity	306,626	299,153
Total Liabilities and Stockholders' Equity	$ 472,278	$ 467,411