Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Fair Value Measurements - Assets and Liabilities on Recurring Basis (Details)

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Note 7 - Fair Value Measurements - Assets and Liabilities on Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member]
$ in Thousands
Sep. 30, 2018
USD ($)
Fair Value, Inputs, Level 1 [Member]  
Derivative assets
Construction reserve funds 35,596
Derivative liabilities
Fair Value, Inputs, Level 2 [Member]  
Derivative assets 1,565
Construction reserve funds
Derivative liabilities 35
Fair Value, Inputs, Level 3 [Member]  
Derivative assets
Construction reserve funds
Derivative liabilities $ 17,928