Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2017
Current Assets:
Cash and cash equivalents	$ 49,587	$ 68,359
Short-term investments	23,101	26,829
Restricted cash	19,402	15,104
Accounts receivable, less allowance for doubtful accounts of $158 and $179	78,978	53,852
Costs and estimated earnings in excess of billings on uncompleted contracts	38,985	51,554
Inventories	18,535	18,448
Income taxes receivable	7,587	8,222
Deferred income taxes	0	3,539
Prepaid expenses	2,804	3,701
Other current assets	268	463
Total Current Assets	239,247	250,071
Property, plant and equipment, net	137,269	139,420
Restricted cash	8,374	9,747
Goodwill and intangible assets, net	1,646	1,719
Other assets	14,057	13,800
Deferred income taxes	5,060	229
Total Assets	405,653	414,986
Current Liabilities:
Current maturities of long-term debt	400	400
Accounts payable	28,780	33,269
Accrued salaries, bonuses and commissions	10,044	14,984
Billings in excess of costs and estimated earnings on uncompleted contracts	36,729	26,166
Accrued product warranty	2,890	3,174
Income taxes payable	1,437	1,219
Other accrued expenses	4,371	5,860
Deferred credit ─ short term	0	507
Total Current Liabilities	84,651	85,579
Long-term debt, net of current maturities	1,200	1,600
Deferred compensation	5,628	5,314
Other long-term liabilities	1,200	1,197
Total Liabilities	92,679	93,690
Commitments and Contingencies (Note E)
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; 12,256,956 and 12,234,656 and shares issued, respectively	122	122
Additional paid-in capital	54,960	54,329
Retained earnings	301,959	310,598
Treasury stock, 806,018 shares at cost	(24,999)	(24,999)
Accumulated other comprehensive loss	(19,068)	(18,754)
Total Stockholders' Equity	312,974	321,296
Total Liabilities and Stockholders' Equity	$ 405,653	$ 414,986