CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Current Assets:
Cash and cash equivalents	$ 68,359	$ 97,720
Short-term investments	26,829	0
Restricted cash	15,104	0
Accounts receivable, less allowance for doubtful accounts of $179 and $811	53,852	101,048
Costs and estimated earnings in excess of billings on uncompleted contracts	51,554	66,106
Inventories	18,448	26,521
Income taxes receivable	8,222	1,713
Deferred income taxes	3,539	4,006
Prepaid expenses	3,701	4,569
Other current assets	463	2,457
Total Current Assets	250,071	304,140
Property, plant and equipment, net	139,420	144,977
Restricted cash	9,747	0
Goodwill and intangible assets, net	1,719	2,059
Other assets	13,800	11,340
Deferred income taxes	229	0
Total Assets	414,986	462,516
Current Liabilities:
Current maturities of long-term debt	400	400
Income taxes payable	1,219	1,459
Accounts payable	33,269	34,985
Accrued salaries, bonuses and commissions	14,984	22,550
Billings in excess of costs and estimated earnings on uncompleted contracts	26,166	43,974
Accrued product warranty	3,174	4,639
Other accrued expenses	5,860	8,212
Deferred credit ─ short term (Note E)	507	2,029
Total Current Liabilities	85,579	118,248
Long-term debt, net of current maturities	1,600	2,000
Deferred compensation (Note I)	5,314	4,840
Deferred income taxes	0	138
Other long-term liabilities	1,197	1,466
Deferred credit ─ long term (Note E)	0	507
Total Liabilities	93,690	127,199
Commitments and Contingencies (Note G)
Stockholders' Equity:
Preferred stock, par value $.01; 5,000,000 shares authorized; none issued	0	0
Common stock, par value $.01; 30,000,000 shares authorized; 12,234,656 and 12,199,511 shares issued, respectively	122	122
Additional paid-in capital	54,329	52,003
Retained earnings	310,598	331,959
Treasury stock, 806,018 shares at cost	(24,999)	(24,999)
Accumulated other comprehensive loss	(18,754)	(23,768)
Total Stockholders' Equity	321,296	335,317
Total Liabilities and Stockholders' Equity	$ 414,986	$ 462,516