Description of Business (Liquidity and Capital Resources) (Details) $ / shares in Units, shares in Millions				3 Months Ended								12 Months Ended
	Nov. 10, 2015	Jun. 15, 2015 USD ($) $ / shares shares	Oct. 22, 2014 USD ($)	Sep. 30, 2015 USD ($) letter_of_credit	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2015 USD ($) letter_of_credit	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Apr. 17, 2015 USD ($)	Apr. 16, 2015 USD ($)	Jan. 02, 2015 USD ($)	Dec. 10, 2014 USD ($)	Dec. 09, 2014 USD ($)	Sep. 17, 2014 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Shares acquired (in shares) | shares		6.9
Average cost per share (in usd per share) | $ / shares		$ 6.55
Repurchases of common stock		$ 45,000,000										$ 45,650,000	$ 0	$ 0
Repurchase costs		$ 700,000
Cash and cash equivalents (including restricted cash)				$ 111,900,000								111,900,000
Working capital				128,000,000								128,000,000
Net income				1,480,000	$ 2,440,000	$ 3,052,000	$ 56,128,000	$ 15,488,000	$ (3,150,000)	$ (5,432,000)	$ (2,054,000)	63,100,000	$ 4,852,000	$ 4,988,000
Photovoltaics Business [Member] | Photovoltaics [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset purchase agreement, selling price																		$ 150,000,000		$ 150,000,000
Working capital adjustment												100,000
Digital Products Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset purchase agreement, selling price			$ 17,500,000
Asset sale, cash consideration			1,500,000
Asset sale, promissory note, principal amount			$ 16,000,000													$ 15,500,000	$ 1,500,000
Accrued interest on note receivable															$ 200,000
Sixth Amendment [Member] | Revolving Credit Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Line of credit facility, maximum borrowing capacity																		$ 15,000,000.00
LIBOR Rate Loan [Member] | Revolving Credit Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Line of credit facility, maximum borrowing capacity																			$ 35,000,000
Standby letters of credit, total amount outstanding				$ 900,000								$ 900,000
Number of standby letters of credit outstanding | letter_of_credit				3								3
Remaining borrowing capacity				$ 8,600,000								$ 8,600,000
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] | Seventh Amendment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Basis spread on variable rate	2.50%