Discontinued Operations (Income Statements) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense	$ 0	$ (200)		$ (184)
Discontinued Operations, Disposed of by Sale [Member] | Photovoltaics Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	0	$ 0	0
Cost of revenue	12	0	12	0
Gross profit (loss)	(12)	0	(12)	0
Operating expense (income)	5	(34)	8	(821)
Income from discontinued operations before income tax expense	(17)	34	(20)	821
Income tax expense	0	(19)	0	(28)
Income from discontinued operations, net of tax	(17)	15	(20)	793
Discontinued Operations, Disposed of by Sale [Member] | Digital Products Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	0	0	0
Cost of revenue	(1)	(445)	0	(494)
Gross profit (loss)	1	445	0	494
Operating expense (income)	(9)	(32)	(4)	(330)
Recognition of previously deferred gain on sale of assets	0	3,804	0	3,804
Income from discontinued operations before income tax expense	10	4,281	4	4,628
Income tax expense	0	(152)	0	(156)
Income from discontinued operations, net of tax	$ 10	$ 4,129	$ 4	$ 4,472