Note 7 - Financing Transactions	12 Months Ended
Sep. 30, 2013
Disclosure Text Block [Abstract]
Long-term Debt [Text Block]	7. FINANCING TRANSACTIONS Hungarian Grant The Hungarian government has pledged a grant of 2.9 billion Hungarian Forint (“HUF”) to Zoltek’s Hungarian subsidiary, which translated at the September 30, 2013 exchange rate, is approximately $13.1 million. The grant is intended to provide a portion of the capital resources to modernize the subsidiary’s facility, establish a research and development center, and support buildup of manufacturing capacity of carbon fibers. Zoltek’s Hungarian subsidiary did not receive any grant funding during fiscal 2013 and 2012 and received approximately HUF 0.1 billion in grant funding during fiscal 2011. As of September 30, 2013, Zoltek Zrt. had received an aggregate of approximately HUF 2.6 billion ($11.7 million) in funding pursuant to the grant. These funds have been recorded as a liability on the Company’s consolidated balance sheet. The Company has presented bank guarantees amounting to 120% of the amount of the grant as received. The Hungarian subsidiary may be required to repay all or a portion of the grant if, among other things, the Hungarian subsidiary: fails to obtain revenue targets; fails to employ an average annual staff of at least 1,200 employees (as of September 30, 2013 Zoltek Zrt. has fewer than 800 employees); fails to utilize regional suppliers for at least 45% of its purchases; fails to obtain consent from the Hungarian government prior to selling assets created with grant funds; fails to use grant funds in accordance with the grant agreement; fails to provide appropriate security for the grant; makes or made an untrue statement or supplies or supplied false data in the grant agreement, grant application or during the time of the grant; defaults on its obligations by more than 30 days; withdraws any consents it gave in the grant agreement; or causes a partial or complete failure or hindrance of the project that is the subject of the grant. These targets must be achieved during a five-year measurement period from October 2013 to October 2018. In November 2013, we petitioned the Hungarian government to amend the current grant requirements, specifically lower the required employment levels and separate each year into its own measurement period rather than a single five-year measurement period. Whether or not our petition is approved by the Hungarian government, we expect that Zoltek Zrt. will comply with the requirements of the grant agreement during the measurement period. If Zoltek Zrt. is unable to comply with the grant agreement, it would be required to pay back all or a portion of the grant funds with possible interest which as of September 30, 2013 could total up to $16.6 million. Financing Activity *Hungarian Financing* On June 15, 2012, Zoltek Zrt. completed an amended credit facility with Raiffeisen Bank Zrt. (the “Lender”) pursuant to which Zoltek Zrt. and the Lender entered into a Credit Facility Agreement, dated as of June 1, 2012, and a Restated and Amended Uncommitted Credit Line Agreement, dated as of June 1, 2012. Under the credit facility, the Lender agreed to provide Zoltek Zrt.: (1) a term facility in the maximum amount of 13.6 million EUR ($18.4 million at the September 30, 2013 exchange rate) (the “Term Facility”) and (2) a multicurrency overdraft facility in the amount of up to 1.12 billion HUF ($5.1 million at the September 30, 2013 exchange rate) (the “Revolving Facility”). The Term Facility is a five-year term loan and bears interest at 4.17%. Principal under the Term Facility is payable semi-annually in equal installments. The Revolving Facility is a revolving credit facility that expires on March 29, 2013 and has a total commitment of 1.120 billion HUF subject to a borrowing base. In addition to the Term Facility and the Revolving Facility, Zoltek Zrt. has obtained from the lender a bank guaranty in the amount of HUF 3.48 billion ($15.7 million at the September 30, 2013 exchange rate) as required by the Hungarian government grant. The obligations of Zoltek Zrt. under this credit facility are guaranteed by the Company. This credit facility contains representations and warranties, and contains a requirement that Zoltek Zrt. maintain a minimum current asset ratio and minimum annual EBITDA, along with other covenants. The Company was in compliance with all covenants as of September 30, 2013. Zoltek Zrt. had previously maintained a credit facility with the Lender, which expired May 30, 2012 and the facility was replaced with the new facility. As of September 30, 2013, the Company had borrowed $14.7 million under this credit facility. *US Financing* On March 30, 2012, the Company entered into a $10 million term loan with Enterprise Bank & Trust (the “Enterprise Loan”) secured by the real property associated with its facilities in the St. Louis, Missouri area. The Enterprise Loan is a seven-year term loan maturing March 30, 2019. Principal of the Enterprise Loan is payable monthly with a balloon payment due at maturity. The Enterprise Loan bears interest at a one-month LIBOR rate, plus 3%. The Company contemporaneously entered into a swap agreement that fixes the interest rate on the Enterprise Loan at 4.75% per annum. The loan agreement contains representations and warranties, and contains a requirement that the Company, on a consolidated basis, maintain minimum fixed charge coverage and leverage ratios, along with other covenants. The Company was in compliance with all covenants as of September 30, 2013. As of September 30, 2013, the principal balance of this term loan was $9.1 million. The Company primarily utilized the proceeds of the Enterprise Loan to repay all outstanding balances under the Company's former U.S. revolving credit facility with its former U.S. Bank; the original borrowings had financed purchase of our St. Peters, Missouri plant. On April 27, 2012, the Company entered into a $15 million revolving credit agreement with JPMorgan Chase, N.A., with interest based on LIBOR plus 2.5%, adjusted monthly. The revolving credit facility is subject to a borrowing base and financial covenants and expires on April 27, 2015. The Company was in compliance with all covenants as of September 30, 2013. As of September 30, 2013, the Company had no borrowings under this revolving credit agreement.

Note 7 - Financing Transactions

12 Months Ended

Sep. 30, 2013

7. FINANCING TRANSACTIONS

Hungarian Grant

The Hungarian government has pledged a grant of 2.9 billion Hungarian Forint (“HUF”) to Zoltek’s Hungarian subsidiary, which translated at the September 30, 2013 exchange rate, is approximately $13.1 million. The grant is intended to provide a portion of the capital resources to modernize the subsidiary’s facility, establish a research and development center, and support buildup of manufacturing capacity of carbon fibers. Zoltek’s Hungarian subsidiary did not receive any grant funding during fiscal 2013 and 2012 and received approximately HUF 0.1 billion in grant funding during fiscal 2011. As of September 30, 2013, Zoltek Zrt. had received an aggregate of approximately HUF 2.6 billion ($11.7 million) in funding pursuant to the grant. These funds have been recorded as a liability on the Company’s consolidated balance sheet. The Company has presented bank guarantees amounting to 120% of the amount of the grant as received.

The Hungarian subsidiary may be required to repay all or a portion of the grant if, among other things, the Hungarian subsidiary: fails to obtain revenue targets; fails to employ an average annual staff of at least 1,200 employees (as of September 30, 2013 Zoltek Zrt. has fewer than 800 employees); fails to utilize regional suppliers for at least 45% of its purchases; fails to obtain consent from the Hungarian government prior to selling assets created with grant funds; fails to use grant funds in accordance with the grant agreement; fails to provide appropriate security for the grant; makes or made an untrue statement or supplies or supplied false data in the grant agreement, grant application or during the time of the grant; defaults on its obligations by more than 30 days; withdraws any consents it gave in the grant agreement; or causes a partial or complete failure or hindrance of the project that is the subject of the grant. These targets must be achieved during a five-year measurement period from October 2013 to October 2018. In November 2013, we petitioned the Hungarian government to amend the current grant requirements, specifically lower the required employment levels and separate each year into its own measurement period rather than a single five-year measurement period. Whether or not our petition is approved by the Hungarian government, we expect that Zoltek Zrt. will comply with the requirements of the grant agreement during the measurement period. If Zoltek Zrt. is unable to comply with the grant agreement, it would be required to pay back all or a portion of the grant funds with possible interest which as of September 30, 2013 could total up to $16.6 million.

Financing Activity

Hungarian Financing

On June 15, 2012, Zoltek Zrt. completed an amended credit facility with Raiffeisen Bank Zrt. (the “Lender”) pursuant to which Zoltek Zrt. and the Lender entered into a Credit Facility Agreement, dated as of June 1, 2012, and a Restated and Amended Uncommitted Credit Line Agreement, dated as of June 1, 2012. Under the credit facility, the Lender agreed to provide Zoltek Zrt.: (1) a term facility in the maximum amount of 13.6 million EUR ($18.4 million at the September 30, 2013 exchange rate) (the “Term Facility”) and (2) a multicurrency overdraft facility in the amount of up to 1.12 billion HUF ($5.1 million at the September 30, 2013 exchange rate) (the “Revolving Facility”).

The Term Facility is a five-year term loan and bears interest at 4.17%. Principal under the Term Facility is payable semi-annually in equal installments. The Revolving Facility is a revolving credit facility that expires on March 29, 2013 and has a total commitment of 1.120 billion HUF subject to a borrowing base. In addition to the Term Facility and the Revolving Facility, Zoltek Zrt. has obtained from the lender a bank guaranty in the amount of HUF 3.48 billion ($15.7 million at the September 30, 2013 exchange rate) as required by the Hungarian government grant. The obligations of Zoltek Zrt. under this credit facility are guaranteed by the Company.

This credit facility contains representations and warranties, and contains a requirement that Zoltek Zrt. maintain a minimum current asset ratio and minimum annual EBITDA, along with other covenants. The Company was in compliance with all covenants as of September 30, 2013. Zoltek Zrt. had previously maintained a credit facility with the Lender, which expired May 30, 2012 and the facility was replaced with the new facility. As of September 30, 2013, the Company had borrowed $14.7 million under this credit facility.

US Financing

On March 30, 2012, the Company entered into a $10 million term loan with Enterprise Bank & Trust (the “Enterprise Loan”) secured by the real property associated with its facilities in the St. Louis, Missouri area. The Enterprise Loan is a seven-year term loan maturing March 30, 2019. Principal of the Enterprise Loan is payable monthly with a balloon payment due at maturity. The Enterprise Loan bears interest at a one-month LIBOR rate, plus 3%. The Company contemporaneously entered into a swap agreement that fixes the interest rate on the Enterprise Loan at 4.75% per annum. The loan agreement contains representations and warranties, and contains a requirement that the Company, on a consolidated basis, maintain minimum fixed charge coverage and leverage ratios, along with other covenants. The Company was in compliance with all covenants as of September 30, 2013. As of September 30, 2013, the principal balance of this term loan was $9.1 million.

The Company primarily utilized the proceeds of the Enterprise Loan to repay all outstanding balances under the Company's former U.S. revolving credit facility with its former U.S. Bank; the original borrowings had financed purchase of our St. Peters, Missouri plant.

On April 27, 2012, the Company entered into a $15 million revolving credit agreement with JPMorgan Chase, N.A., with interest based on LIBOR plus 2.5%, adjusted monthly. The revolving credit facility is subject to a borrowing base and financial covenants and expires on April 27, 2015. The Company was in compliance with all covenants as of September 30, 2013. As of September 30, 2013, the Company had no borrowings under this revolving credit agreement.