Detail of Certain Balance Sheet Accounts (Tables)

12 Months Ended

Sep. 30, 2016

Detail Of Certain Balance Sheet Accounts [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

	Years Ended September 30,
	2016		2015
Balance at beginning of period	$	842	$	780
Additions to costs and expenses		360		416
Deductions for uncollectible receivables written off, net of recoveries		(466)		(354)
Balance at end of period	$	736	$	842

Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]

	Years Ended September 30,
	2016		2015
Accounts payable, trade	$	64,963	$	47,033
Accrued compensation and benefits		26,827		22,527
Accrued insurance liabilities		5,464		4,518
Other accrued expenses		11,568		8,832
	$	108,822	$	82,910

Contracts In Progresstable [Text Block]

	Years Ended September 30,
	2016		2015
Costs incurred on contracts in progress	$	409,075	$	329,942
Estimated earnings		48,618		37,576
		457,693		367,518
Less--Billings to date		(466,368)		(380,365)
Net contracts in progress	$	(8,675)	$	(12,847)
Costs and estimated earnings in excess of billings		15,554		12,318
Less--Billings in excess of costs and estimated earnings		(24,229)		(25,165)
Net contracts in progress	$	(8,675)	$	(12,847)

Schedule of Other Assets, Noncurrent [Table Text Block]

	Years Ended September 30,
	2016		2015
Deferred tax assets	$	-	$	147
Executive Savings Plan assets		599		617
Securities and equity investments		919		919
Other		2,192		1,301
Total	$	3,710	$	2,984

Schedule of Cost Method Investments [Table Text Block]

	Years Ended September 30,
	2016		2015
Carrying value	$	919	$	919
Unrealized gains		159		66
Fair value	$	1,078	$	985