Long-term Debt and Other Credit Arrangements	12 Months Ended
Long-term Debt and Other Credit Arrangements	Apr. 30, 2021
Debt Disclosure [Abstract]
Long-term Debt and Other Credit Arrangements	Long-term Debt and Other Credit Arrangements On May 6, 2013, the Company entered into a credit and security agreement (the "Loan Agreement") consisting of a $20 million revolving credit facility ("Line of Credit") which matured on May 1, 2018 and was extended to March 1, 2021 on March 12, 2018, a term loan in the amount of $3,450,000 which matured on May 1, 2020 ("Term Loan A") and a term loan in the amount of $1,550,000 which matured on May 1, 2020 (Term Loan B and together with Term Loan A, the "Term Loans"). On June 19, 2019, the Company entered into a Security Agreement pursuant to which the Company granted a security interest in substantially all of its assets to secure its obligations under the Loan Agreement. In September 2019, the Company paid off Term Loan A and Term Loan B and terminated the related interest rate swap agreements. On December 13, 2019, the Company entered into an amendment to the Loan Agreement and the Line of Credit to effect a change to an asset based lending arrangement based on eligible accounts receivable and inventory, with the available amount not to exceed $20 million through January 31, 2020, and with such maximum amount reduced to $15 million thereafter. This amendment replaced the prior financial covenants with new financial covenants, including minimum monthly liquidity and EBITDA requirements. Additionally, a requirement for the repatriation of foreign cash and restrictions on the payment of dividends were added. At April 30, 2020, the Company was not in compliance with all of the financial covenants under the revolving credit facility. On July 20, 2020, the Company entered into an amendment to the Loan Agreement and Line of Credit which effected changes in certain financial covenants set forth in the Loan Agreement and included a waiver of the non-compliance. On January 28, 2021, the Company entered into another amendment which effected changes (i) extending the maturity date under the Credit Agreement and Revolving Note from February 1, 2021 to May 3, 2021; (ii) establishing a minimum EBITDA covenant for the fiscal quarter ending April 30, 2021 of $1,000,000, determined for the four-quarter period then ending; and (iii) revising the covenant regarding delivery of financial projections to the Bank to, among other things, provide projections for the next succeeding fiscal year. On April 27, 2021, the Company entered into another amendment which effected changes (i) extending the maturity date under the Credit Agreement and Revolving Note from May 3, 2021 to July 30, 2021; and (ii) revising the minimum EBITDA covenant to permit EBITDA to be increased by (a) scheduled one-time non-recurring addbacks in an amount not to exceed $250,000, and (b) solely for the four-quarter period ending April 30, 2021, a one-time addback in an amount not to exceed $600,000 for non-cash, stock-based compensation paid by the Company. These amendments did not change the amount of availability under the revolving credit facility. At April 30, 2021, the Company was in compliance with all the financial covenants under its revolving credit facility. At April 30, 2021, there were advances of $6.8 million and $704,000 in letters of credit outstanding, leaving $7.5 million available under the Line of Credit. The borrowing rate under the Line of Credit at that date was 4.750%. Monthly interest payments under the Line of Credit were payable at the greater of the Daily One Month LIBOR interest rate or 0.75% plus 4.0%. At April 30, 2021, there were bank guarantees issued by foreign banks outstanding to customers in the amount of $3.2 million, $61,000, $18,000, $9,000 and $257,000, and with expiration dates in fiscal years 2022, 2023, 2024, 2025 and 2027, respectively, collateralized by a $6.0 million corporate guarantee and certain assets of the Company's subsidiaries in India. At April 30, 2020, there were advances of $4.7 million and $512,000 in letters of credit outstanding under the Line of Credit. The borrowing rate at that date was 4.13%. At April 30, 2020, there were foreign bank guarantees outstanding to customers in the amount of $1.6 million, $297,000 and $74,000 with expiration dates in fiscal years 2021, 2022, and 2023, respectively, collateralized by a $6.0 million corporate guarantee and certain assets of the Company's subsidiaries in India.