Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Commitments and Contingencies (Details)

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Note 8 - Commitments and Contingencies (Details) - USD ($)
 3 Months Ended 6 Months Ended 48 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Note 8 - Commitments and Contingencies (Details) [Line Items]          
Bonds and Letters of Credit Outstanding, Amount     $ 1,773,000    
American International Group, Inc [Member]          
Note 8 - Commitments and Contingencies (Details) [Line Items]          
Period of Finite Risk Insurance Policy     25 years    
Maximum AllowableCoverageOfInsurancePolicy $ 39,000,000   $ 39,000,000    
Financial Assurance Coverage Amount Under Insurance Policy 38,454,000   38,454,000    
Sinking Fund Related to Insurance Policy 15,443,000   15,443,000    
Interest Earned on Sinking Fund 972,000   972,000    
Interest Income, Other $ 6,000 $ 5,000 $ 14,000 $ 11,000  
Insurers Obligation to Entity on Termination of Contract 100.00%   100.00%    
PFNWR Facility [Member] | American International Group, Inc [Member]          
Note 8 - Commitments and Contingencies (Details) [Line Items]          
Interest Income, Other $ 2,000 $ 1,000 $ 3,000 $ 3,000  
Financial Assurance Coverage Amount Under Second Insurance Policy 7,800,000   $ 7,800,000    
Annual Growth Rate of Financial Assurance Coverage Amount Under Second Insurance Policy     1.50%    
Maximum Financial Assurance Coverage Amount Under Second Insurance Policy 8,200,000   $ 8,200,000    
Sinking Fund Related to Second Insurance Policy 5,908,000   5,908,000    
Interest Earned on Sinking Fund Under Second Insurance Policy $ 208,000   $ 208,000    
Period of Finite Second Insurance Policy     4 years    
Minimum [Member] | PFNWR Facility [Member] | American International Group, Inc [Member]          
Note 8 - Commitments and Contingencies (Details) [Line Items]          
Renewal Fee for Additional Year Under Second Insurance Policy         $ 41,000
Maximum [Member] | PFNWR Facility [Member] | American International Group, Inc [Member]          
Note 8 - Commitments and Contingencies (Details) [Line Items]          
Renewal Fee for Additional Year Under Second Insurance Policy         $ 46,000