Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Current Assets:
Cash and cash equivalents	$ 48,237	$ 68,359
Short-term investments	20,925	26,829
Restricted cash	22,943	15,104
Accounts receivable, less allowance for doubtful accounts of $264 and $179	68,074	53,852
Costs and estimated earnings in excess of billings on uncompleted contracts	44,008	51,554
Inventories	22,012	18,448
Income taxes receivable	7,678	8,222
Deferred income taxes	0	3,539
Prepaid expenses	1,760	3,701
Other current assets	274	463
Total Current Assets	235,911	250,071
Property, plant and equipment, net	134,675	139,420
Restricted cash	7,535	9,747
Goodwill and intangible assets, net	1,602	1,719
Other assets	13,586	13,800
Deferred income taxes	6,828	229
Total Assets	400,137	414,986
Current Liabilities:
Current maturities of long-term debt	400	400
Accounts payable	35,210	33,269
Accrued salaries, bonuses and commissions	12,079	14,984
Billings in excess of costs and estimated earnings on uncompleted contracts	28,722	26,166
Accrued product warranty	2,241	3,174
Income taxes payable	1,437	1,219
Other accrued expenses	5,618	5,860
Deferred credit ─ short term	0	507
Total Current Liabilities	85,707	85,579
Long-term debt, net of current maturities	1,200	1,600
Deferred compensation	5,600	5,314
Other long-term liabilities	1,238	1,197
Total Liabilities	93,745	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; 12,268,956 and 12,234,656 and shares issued, respectively	123	122
Additional paid-in capital	55,958	54,329
Retained earnings	295,653	310,598
Treasury stock, 806,018 shares at cost	(24,999)	(24,999)
Accumulated other comprehensive loss	(20,343)	(18,754)
Total Stockholders' Equity	306,392	321,296
Total Liabilities and Stockholders' Equity	$ 400,137	$ 414,986