Long-Term Debt	12 Months Ended
Sep. 30, 2019
Debt Disclosure [Abstract]
Long-Term Debt	13. Long-Term Debt The Company had no long-term debt outstanding at September 30, 2019 and 2018. On March 2, 2011, the Company entered into a credit agreement with Frost Bank (the “Original Credit Agreement”). The Original Credit Agreement has been amended periodically since 2011 (as so amended, the “Credit Agreement”). In November 2018, the Company extended the maturity of the Credit Agreement from April 2019 to April 2020. In March 2019, the Company entered into an amendment to the Credit Agreement that altered the unencumbered liquid assets covenant to (i) reduce the minimum threshold from $10 million to $5 million and (ii) include unencumbered assets held outside the United States. The amendment also added another financial covenant that requires the Company to maintain a tangible net worth of not less than $140 million. Additionally, pursuant to the amendment, the Company’s principal place of business and the related real estate, located at 7007 Pinemont Drive, Houston, Texas was added as collateral securing its obligations under the credit agreement. In November 2019, we further amended the credit agreement to (i) extend the maturity date from April 2020 to April 2022, (ii) increase the unencumbered liquid assets covenant threshold from $5 million to $10 million effective in the first quarter of fiscal year 2021, (iii) to increase the tangible net worth requirement from $140 million to $145 million in the first quarter of fiscal year 2021 and (iv) remove the requirement that we obtain the consent of Frost Bank prior to paying dividends or repurchasing stock so long as we are in compliance with the covenants of the credit agreement. Under the Credit Agreement, the Company can borrow up to $30.0 million with amounts available for borrowing determined by a borrowing base. The borrowing base is determined based upon certain of the Company’s assets which include (i) 80% of certain accounts receivable plus (ii) 50% of certain notes receivable (such result not to exceed $10 million) plus (iii) 25% of certain inventories (such result not to exceed $20 million). Subject to the borrowing base calculation, as of September 30, 2019, the amount available for borrowing was $27.0 million. Several of the Company’s domestic subsidiaries have guaranteed the obligations of the Company under the Credit Agreement and such subsidiaries have secured their obligations under such guarantees by the pledge of substantially all of the assets of such subsidiaries. The Company is required to make monthly interest payments on borrowed funds. The Credit Agreement limits the incurrence of additional indebtedness and contains other covenants customary in agreements of this type. The interest rate for borrowings under the Credit Agreement is based on the Wall Street Journal prime rate, which was 5.0% at September 30, 2019. At September 30, 2019, the Company was in compliance with all covenants under the Credit Agreement.

Long-Term Debt

12 Months Ended

Sep. 30, 2019

13. Long-Term Debt

The Company had no long-term debt outstanding at September 30, 2019 and 2018.

On March 2, 2011, the Company entered into a credit agreement with Frost Bank (the “Original Credit Agreement”). The Original Credit Agreement has been amended periodically since 2011 (as so amended, the “Credit Agreement”). In November 2018, the Company extended the maturity of the Credit Agreement from April 2019 to April 2020. In March 2019, the Company entered into an amendment to the Credit Agreement that altered the unencumbered liquid assets covenant to (i) reduce the minimum threshold from $10 million to $5 million and (ii) include unencumbered assets held outside the United States. The amendment also added another financial covenant that requires the Company to maintain a tangible net worth of not less than $140 million. Additionally, pursuant to the amendment, the Company’s principal place of business and the related real estate, located at 7007 Pinemont Drive, Houston, Texas was added as collateral securing its obligations under the credit agreement. In November 2019, we further amended the credit agreement to (i) extend the maturity date from April 2020 to April 2022, (ii) increase the unencumbered liquid assets covenant threshold from $5 million to $10 million effective in the first quarter of fiscal year 2021, (iii) to increase the tangible net worth requirement from $140 million to $145 million in the first quarter of fiscal year 2021 and (iv) remove the requirement that we obtain the consent of Frost Bank prior to paying dividends or repurchasing stock so long as we are in compliance with the covenants of the credit agreement. Under the Credit Agreement, the Company can borrow up to $30.0 million with amounts available for borrowing determined by a borrowing base. The borrowing base is determined based upon certain of the Company’s assets which include (i) 80% of certain accounts receivable plus (ii) 50% of certain notes receivable (such result not to exceed $10 million) plus (iii) 25% of certain inventories (such result not to exceed $20 million). Subject to the borrowing base calculation, as of September 30, 2019, the amount available for borrowing was $27.0 million. Several of the Company’s domestic subsidiaries have guaranteed the obligations of the Company under the Credit Agreement and such subsidiaries have secured their obligations under such guarantees by the pledge of substantially all of the assets of such subsidiaries. The Company is required to make monthly interest payments on borrowed funds. The Credit Agreement limits the incurrence of additional indebtedness and contains other covenants customary in agreements of this type. The interest rate for borrowings under the Credit Agreement is based on the Wall Street Journal prime rate, which was 5.0% at September 30, 2019. At September 30, 2019, the Company was in compliance with all covenants under the Credit Agreement.