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Note 15 - Asset Retirement Obligations (AROs) (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Change in Asset Retirement Obligation [Table Text Block]

(in thousands)

  

2019

    

2018

  

Asset Retirement Obligations

                

Beginning Balance

   $ 9,117     $ 8,719  

New Obligations Recognized

     -       -  

Adjustments Due to Revisions in Cash Flow Estimates

     3,099       -  

Accrued Accretion

     440       398  

Settlements

     -       -  

Ending Balance

   $ 12,656     $ 9,117  

Asset Retirement Costs Capitalized

                

Beginning Balance

   $ 2,983     $ 2,983  

New Obligations Recognized

     -       -  

Adjustments Due to Revisions in Cash Flow Estimates

     3,099       -  

Settlements

     -       -  

Ending Balance

   $ 6,082     $ 2,983  

Accumulated Depreciation – Asset Retirement Costs Capitalized

                

Beginning Balance

   $ 1,034     $ 915  

New Obligations Recognized

     -       -  

Adjustments Due to Revisions in Cash Flow Estimates

     -       -  

Depreciation Expense

     163       119  

Settlements

     -       -  

Ending Balance

   $ 1,197     $ 1,034  

Settlements

  

None

    

None

  

Original Capitalized Asset Retirement Cost – Retired

   $ -     $ -  

Accumulated Depreciation

     -       -  

Asset Retirement Obligation

   $ -     $ -  

Settlement Cost

     -       -  

Gain on Settlement – Deferred Under Regulatory Accounting

   $ -     $ -