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Derivative and Hedging Instruments (Details-2) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Commodity Derivative Contracts [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts | $ 230 | $ 801
Gross amounts offset in balance sheet | (192) | (342)
Collateral posted against derivative positions | 0 | 0
Net amount presented in balance sheet | 38 | 459
Financial Transmission Rights [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts | 73 | 241
Gross amounts offset in balance sheet | 0 | 0
Collateral posted against derivative positions | 0 | 0
Net amount presented in balance sheet | $ 73 | $ 241

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