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No definition available.

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Represents the average number of days by which past due accounts receivable are overdue.

+ References

No definition available.

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Represents the number of semi-annual payments under a debt instrument.

+ References

No definition available.

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Represents the principal amount to be repaid in installments before the bullet payment is made at the end of the loan period.

+ References

No definition available.

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Represents the amount of proceeds received during the period from payments on accounts receivable that were overdue.

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No definition available.

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

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No definition available.

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The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

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No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

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No definition available.

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- Definition

The adjustment to expense previously capitalized costs of drilling exploratory wells when proved reserves are not found or when the entity obtains information that raises substantial doubt about the economic or operational viability of the project.

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Amount of cash inflow for proceeds from settlement of insurance claim, classified as operating activities. Excludes insurance settlement classified as investing activities.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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Percentage of remaining performance obligation to total remaining performance obligation not recognized as revenue.

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-Paragraph 13
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Note 1 - General and Basis of Presentation 1 (Details Textual) $ in Thousands				1 Months Ended	3 Months Ended		4 Months Ended	6 Months Ended		12 Months Ended
	May 13, 2020 USD ($)	Apr. 20, 2020 USD ($)	Apr. 06, 2020 USD ($)	Jul. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jul. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Apr. 30, 2020 USD ($)
Exploration Abandonment and Impairment Expense					$ 0	$ 0		$ 0	$ 0
Cash, FDIC Insured Amount					11,400			11,400		$ 12,900
Cash, Uninsured Amount					116,100			116,100		84,800
Accounts Receivable, after Allowance for Credit Loss, Current, Total					179,757			179,757		$ 154,525
Product [Member]
Revenue, Remaining Performance Obligation, Amount					$ 63,500			$ 63,500
Revenue, Remaining Performance Obligation, Percentage					100.00%			100.00%
Kenya Power and Lighting Co LTD [Member]
Accounts Receivable, Past Due					$ 54,800			$ 54,800
Accounts Receivable, Past Due, Average Number of Days Overdue					81			81
Kenya Power and Lighting Co LTD [Member] \| Subsequent Event [Member]
Proceeds, Overdue Accounts Receivable				$ 8,800
ENNE [Member]
Accounts Receivable, Past Due					$ 24,000			$ 24,000
ENNE [Member] \| February and March [Member]
Accounts Receivable, Past Due					20,100			20,100
ENNE [Member] \| October 2018 and April 2019 [Member]
Accounts Receivable, Past Due					$ 4,000			$ 4,000
ENNE [Member] \| Subsequent Event [Member]
Proceeds, Overdue Accounts Receivable				$ 700
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Primary Customers [Member]
Concentration Risk, Percentage								52.00%		58.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Sierra Pacific Power Company And Nevada Power Company [Member]
Concentration Risk, Percentage					17.20%	16.50%		18.30%	17.40%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Southern California Public Power Authority [Member]
Concentration Risk, Percentage					20.00%	17.20%		19.50%	18.30%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Kenya Power and Lighting Co LTD [Member]
Concentration Risk, Percentage					16.00%	16.60%		15.70%	16.00%
Non-US [Member]
Accounts Receivable, after Allowance for Credit Loss, Current, Total					$ 151,600			$ 151,600		$ 118,800
Electricity Segment [Member] \| Puna Geothermal Power Plant [Member]
Proceeds from Insurance Settlement, Operating Activities					800			3,900
Electricity Segment [Member] \| Puna Geothermal Power Plant [Member] \| Cost of Sales [Member]
Proceeds from Insurance Settlement, Operating Activities					$ 3,300			8,200
Electricity Segment [Member] \| Puna Geothermal Power Plant [Member] \| General and Administrative Expense [Member]
Proceeds from Insurance Settlement, Operating Activities								$ 3,000
COVID 19 [Member]
Proceeds from Issuance of Long-term Debt, Total							$ 400,000
Senior Unsecured Bonds, Series 3 [Member]
Proceeds from Issuance of Long-term Debt, Total	$ 15,300	$ 14,500	$ 50,000
Debt Instrument, Interest Rate, Stated Percentage	4.45%	4.45%	4.45%
Second Addendum Migdal Loan [Member]
Debt Instrument, Interest Rate, Stated Percentage											5.44%
Debt Instrument, Face Amount											$ 50,000
Debt Instrument, Principal to Be Repaid in Installments											$ 31,500
Debt Instrument, Number of Semi-annual Payments											15
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid											$ 18,500