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Share-Based Compensation (Details Narrative) - USD ($)		1 Months Ended		3 Months Ended	9 Months Ended
	Feb. 01, 2021	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2022	Jan. 31, 2022	Jan. 31, 2021	Feb. 09, 2022	Feb. 08, 2022	Jan. 18, 2018	Dec. 31, 2015
3Dent Acquisition [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of base purchase price	$ 1,451,584
Stock Issued During Period, Shares, New Issues	361,991
Business Acquisition, Share Price	$ 4.01
Fair Value of Purchase	$ 1,161,267
Business comibination quarterly compensation expenses recognized consideration paid	$ 171,000
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation options, grants in period, gross				793,850		248,876
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value				$ 11,560	$ 11,560
Options unvested				835,000	835,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term					9 years 10 months 24 days
Share-based payment arrangement, expense					$ 183,000	$ 296,000
Share-based Payment Arrangement, Option [Member] | Employee [Member] | Subject to Service- Based Vesting Requirements [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to non-vested stock				$ 0	$ 0
Restricted stock option granted					51,547
Non-vested Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to non-vested stock				102,000	$ 102,000
Share-based compensation of weighted-average period					1 year
Performance Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation options, grants in period, gross					66,667
Shares vested and outstanding			40,668
Debt expire date			Dec. 15, 2021
Performance Stock Options [Member] | Two Executives [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation options, grants in period, gross			81,337
Performance Stock Options [Member] | Employees and Executives [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation options, grants in period, gross		344,723			230,000
Stock options vesting period description		The awards vest over 2 years provided there is positive total shareholder return (e.g. share price increase) as measured by the closing share price on January 14, 2022 and January 14, 2023.
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value				$ 0	$ 0
Options unvested				230,000	230,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term					9 years 1 month 6 days
Share-based payment arrangement, expense					$ 123,000	$ 43,000
Unrecognized compensation cost related to non-vested stock				$ 242,000,000,000	$ 242,000,000,000
Share-based compensation of weighted-average period					1 year 1 month 6 days
Non-vested Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock option granted					777,764	10,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense					$ 43,000	$ 12,000
Share-based compensation of weighted-average period					1 year 4 months 24 days
Unrecognized compensation cost				$ 54,000	$ 54,000
Equity Option [Member] | Employee [Member] | Subject to Service- Based Vesting Requirements [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense					$ 0	$ 30,000
2015 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement shares authorized										1,332,036
Capital shares reserved for future issuance				696,627	696,627
2018 Inducement Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement shares authorized							275,000	250,000
Capital shares reserved for future issuance				11,487	11,487				25,000

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