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Stock Options and Share-based Compensation	9 Months Ended
	Jan. 31, 2021
Equity [Abstract]
Stock Options and Share-based Compensation	Stock Options and Share-based Compensation Compensation costs related to stock options and other stock awards granted by the Company are charged against operating expenses during their vesting period, under ASC 718, "Compensation-Stock Compensation." In May 2020, the Company granted 12,045 RSUs under the 2017 Omnibus Incentive Plan ("2017 Plan"). These RSUs include a service component that vests over a one-year period. The Company granted 83,816 RSUs under the 2017 Omnibus Incentive Plan in June 2020. These RSUs include both a service and a performance component, vesting over a three-year period. The recognized expense is based upon the vesting period for service criteria and estimated attainment of the performance criteria at the end of the three-year period, based on the ratio of cumulative days of service to total days over the three-year period. The Company recorded share-based compensation expense during the three and nine months ended January 31, 2021 of $129,000 and $344,000, respectively, with the remaining estimated share-based compensation expense of $805,000 to be recorded over the remaining vesting periods. The Company recorded share-based compensation expense during the three and nine months ended January 31, 2020 of $126,000 and $208,000, respectively. Directors' fees paid with shares of common stock in lieu of cash in accordance with Director compensation guidelines were $41,000 for each of the nine month periods ended January 31, 2021 and January 31, 2020 and were included in the share-based compensation on the condensed consolidated statements of cash flows.

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- Definition

The entire disclosure for shareholders' equity and share-based payment arrangement. Includes, but is not limited to, disclosure of policy and terms of share-based payment arrangement, deferred compensation arrangement, and employee stock purchase plan (ESPP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-URI http://asc.fasb.org/topic&trid=2228938

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