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Aggregate dividends declared during the period for each share of common stock outstanding.

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Fixed interest rate related to the interest rate derivative.

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Note 11 - Subsequent Events (Details Textual) $ / shares in Units, $ in Thousands, ₪ in Billions			3 Months Ended
	Aug. 04, 2020 USD ($) $ / shares	Jul. 20, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jul. 01, 2020 USD ($)	Jul. 01, 2020 ILS (₪)
Dividends, Common Stock, Total			$ 5,719	$ 5,614	$ 5,589	$ 5,579
Subsequent Event [Member]
Dividends, Common Stock, Total	$ 5,600
Common Stock, Dividends, Per Share, Declared (in dollars per share) \| $ / shares	$ 0.11
Dividends Payable, Date of Record	Aug. 18, 2020
Dividends Payable, Date to be Paid	Sep. 01, 2020
Subsequent Event [Member] \| Pomona Energy Storage [Member] \| Southern California Edison Company [Member]
Energy Storage Resource Agreement, Term (Year)		10 years
Subsequent Event [Member] \| Pomona Energy Storage [Member]
Business Combination, Consideration Transferred, Total		$ 43,900
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital		$ 3,100
Senior Unsecured Bonds, Series 4 [Member] \| Subsequent Event [Member]
Debt Instrument, Face Amount							$ 290,000	₪ 1
Debt Instrument, Interest Rate, Stated Percentage							3.35%	3.35%
Debt Instrument, Number of Annual Payments							10	10
Senior Unsecured Bonds, Series 4 [Member] \| Subsequent Event [Member] \| Cross Currency Interest Rate Contract [Member]
Derivative, Fixed Interest Rate							4.34%	4.34%