Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Current Assets:
Cash and cash equivalents	$ 40,075	$ 68,359
Short-term investments	15,218	26,829
Restricted cash	19,952	15,104
Accounts receivable, less allowance for doubtful accounts of $239 and $179	72,682	53,852
Costs and estimated earnings in excess of billings on uncompleted contracts	70,939	51,554
Inventories	22,854	18,448
Income taxes receivable	7,471	8,222
Deferred income taxes	0	3,539
Prepaid expenses	2,978	3,701
Other current assets	253	463
Total Current Assets	252,422	250,071
Property, plant and equipment, net	130,545	139,420
Restricted cash	3,635	9,747
Goodwill and intangible assets, net	1,558	1,719
Other assets	13,882	13,800
Deferred income taxes	6,608	229
Total Assets	408,650	414,986
Current Liabilities:
Current maturities of long-term debt	400	400
Accounts payable	33,726	33,269
Accrued salaries, bonuses and commissions	16,268	14,984
Billings in excess of costs and estimated earnings on uncompleted contracts	39,437	26,166
Accrued product warranty	2,363	3,174
Income taxes payable	1,418	1,219
Other accrued expenses	5,507	5,860
Deferred credit ─ short term	0	507
Total Current Liabilities	99,119	85,579
Long-term debt, net of current maturities	1,200	1,600
Deferred compensation	5,652	5,314
Other long-term liabilities	1,232	1,197
Total Liabilities	107,203	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; 12,276,056 and 12,234,656 and shares issued, respectively	123	122
Additional paid-in capital	56,235	54,329
Retained earnings	292,974	310,598
Treasury stock, 806,018 shares at cost	(24,999)	(24,999)
Accumulated other comprehensive loss	(22,886)	(18,754)
Total Stockholders' Equity	301,447	321,296
Total Liabilities and Stockholders' Equity	$ 408,650	$ 414,986