Date the declared dividend will be paid, in CCYY-MM-DD format.

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Date the dividend to be paid was declared, in CCYY-MM-DD format.

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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-Topic 942
-SubTopic 405
-Section 45
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Aggregate dividends paid during the period for each share of preferred stock outstanding.

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4. Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Preferred Stock Dividends	$ 1,081	$ 1,081	$ 2,162	$ 2,162
Dividends paid per share	$ 0.65625	$ 0.65625	$ 1.3125	$ 1.3125
Series E Preferred Stock [Member] \| Dividends Paid 7/1/2019 [Member]
Preferred Stock Dividends			$ 1,081
Declaration Date			Jun. 05, 2019
Record Date			Jun. 17, 2019
Payment Date			Jul. 01, 2019
Dividends paid per share			$ 0.65625
Series E Preferred Stock [Member] \| Dividends Paid 10/1/2019 [Member]
Preferred Stock Dividends			$ 1,081
Declaration Date			Sep. 04, 2019
Record Date			Sep. 16, 2019
Payment Date			Oct. 01, 2019
Dividends paid per share			$ 0.65625