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Note 11 - Pension Plan and Other Postretirement Benefits - Asset Allocation Ranges By Asset Class and PBO Funded Status (Details) - Pension Plan [Member]
Dec. 31, 2019
Equity Securities [Member] | Permitted Range, Less Than 85 Percent PBO [Member] | Minimum [Member]  
Asset allocations 39.00%
Equity Securities [Member] | Permitted Range, Less Than 85 Percent PBO [Member] | Maximum [Member]  
Asset allocations 59.00%
Equity Securities [Member] | Permitted Range, Equal to or Greater than 85 Percent PBO [Member] | Minimum [Member]  
Asset allocations 34.00%
Equity Securities [Member] | Permitted Range, Equal to or Greater than 85 Percent PBO [Member] | Maximum [Member]  
Asset allocations 54.00%
Equity Securities [Member] | Permitted Range, Equal to or Greater than 90 Percent PBO [Member] | Minimum [Member]  
Asset allocations 24.00%
Equity Securities [Member] | Permitted Range, Equal to or Greater than 90 Percent PBO [Member] | Maximum [Member]  
Asset allocations 44.00%
Equity Securities [Member] | Permitted Range, Equal to or Greater than 95% PBO [Member] | Minimum [Member]  
Asset allocations 14.00%
Equity Securities [Member] | Permitted Range, Equal to or Greater than 95% PBO [Member] | Maximum [Member]  
Asset allocations 34.00%
Equity Securities [Member] | Permitted Range, Equal to or Greater than 100 Percent PBO [Member] | Minimum [Member]  
Asset allocations 0.00%
Equity Securities [Member] | Permitted Range, Equal to or Greater than 100 Percent PBO [Member] | Maximum [Member]  
Asset allocations 20.00%
Investment Grade Fixed Income Securities [Member] | Permitted Range, Less Than 85 Percent PBO [Member] | Minimum [Member]  
Asset allocations 22.00%
Investment Grade Fixed Income Securities [Member] | Permitted Range, Less Than 85 Percent PBO [Member] | Maximum [Member]  
Asset allocations 42.00%
Investment Grade Fixed Income Securities [Member] | Permitted Range, Equal to or Greater than 85 Percent PBO [Member] | Minimum [Member]  
Asset allocations 30.00%
Investment Grade Fixed Income Securities [Member] | Permitted Range, Equal to or Greater than 85 Percent PBO [Member] | Maximum [Member]  
Asset allocations 50.00%
Investment Grade Fixed Income Securities [Member] | Permitted Range, Equal to or Greater than 90 Percent PBO [Member] | Minimum [Member]  
Asset allocations 40.00%
Investment Grade Fixed Income Securities [Member] | Permitted Range, Equal to or Greater than 90 Percent PBO [Member] | Maximum [Member]  
Asset allocations 60.00%
Investment Grade Fixed Income Securities [Member] | Permitted Range, Equal to or Greater than 95% PBO [Member] | Minimum [Member]  
Asset allocations 53.00%
Investment Grade Fixed Income Securities [Member] | Permitted Range, Equal to or Greater than 95% PBO [Member] | Maximum [Member]  
Asset allocations 73.00%
Investment Grade Fixed Income Securities [Member] | Permitted Range, Equal to or Greater than 100 Percent PBO [Member] | Minimum [Member]  
Asset allocations 70.00%
Investment Grade Fixed Income Securities [Member] | Permitted Range, Equal to or Greater than 100 Percent PBO [Member] | Maximum [Member]  
Asset allocations 100.00%
Below Investment Grade Fixed Income Securities [Member] | Permitted Range, Less Than 85 Percent PBO [Member] | Minimum [Member]  
Asset allocations 0.00% [1]
Below Investment Grade Fixed Income Securities [Member] | Permitted Range, Less Than 85 Percent PBO [Member] | Maximum [Member]  
Asset allocations 15.00% [1]
Below Investment Grade Fixed Income Securities [Member] | Permitted Range, Equal to or Greater than 85 Percent PBO [Member] | Minimum [Member]  
Asset allocations 0.00% [1]
Below Investment Grade Fixed Income Securities [Member] | Permitted Range, Equal to or Greater than 85 Percent PBO [Member] | Maximum [Member]  
Asset allocations 15.00% [1]
Below Investment Grade Fixed Income Securities [Member] | Permitted Range, Equal to or Greater than 90 Percent PBO [Member] | Minimum [Member]  
Asset allocations 0.00% [1]
Below Investment Grade Fixed Income Securities [Member] | Permitted Range, Equal to or Greater than 90 Percent PBO [Member] | Maximum [Member]  
Asset allocations 15.00% [1]
Below Investment Grade Fixed Income Securities [Member] | Permitted Range, Equal to or Greater than 95% PBO [Member] | Minimum [Member]  
Asset allocations 0.00% [1]
Below Investment Grade Fixed Income Securities [Member] | Permitted Range, Equal to or Greater than 95% PBO [Member] | Maximum [Member]  
Asset allocations 10.00% [1]
Below Investment Grade Fixed Income Securities [Member] | Permitted Range, Equal to or Greater than 100 Percent PBO [Member] | Minimum [Member]  
Asset allocations 0.00% [1]
Below Investment Grade Fixed Income Securities [Member] | Permitted Range, Equal to or Greater than 100 Percent PBO [Member] | Maximum [Member]  
Asset allocations 10.00% [1]
Other Asset Categories [Member] | Permitted Range, Less Than 85 Percent PBO [Member] | Minimum [Member]  
Asset allocations 5.00% [2]
Other Asset Categories [Member] | Permitted Range, Less Than 85 Percent PBO [Member] | Maximum [Member]  
Asset allocations 20.00% [2]
Other Asset Categories [Member] | Permitted Range, Equal to or Greater than 85 Percent PBO [Member] | Minimum [Member]  
Asset allocations 5.00% [2]
Other Asset Categories [Member] | Permitted Range, Equal to or Greater than 85 Percent PBO [Member] | Maximum [Member]  
Asset allocations 20.00% [2]
Other Asset Categories [Member] | Permitted Range, Equal to or Greater than 90 Percent PBO [Member] | Minimum [Member]  
Asset allocations 5.00% [2]
Other Asset Categories [Member] | Permitted Range, Equal to or Greater than 90 Percent PBO [Member] | Maximum [Member]  
Asset allocations 20.00% [2]
Other Asset Categories [Member] | Permitted Range, Equal to or Greater than 95% PBO [Member] | Minimum [Member]  
Asset allocations 0.00% [2]
Other Asset Categories [Member] | Permitted Range, Equal to or Greater than 95% PBO [Member] | Maximum [Member]  
Asset allocations 15.00% [2]
Other Asset Categories [Member] | Permitted Range, Equal to or Greater than 100 Percent PBO [Member] | Minimum [Member]  
Asset allocations 0.00% [2]
Other Asset Categories [Member] | Permitted Range, Equal to or Greater than 100 Percent PBO [Member] | Maximum [Member]  
Asset allocations 15.00% [2]
[1] Includes (but not limited to) High Yield Bond Fund and Emerging Markets Debt funds.
[2] Other category may include cash, alternatives, and/or other investment strategies that may be classified other than equity or fixed income, such as the Dynamic Asset Allocation fund or the SEI Energy Debt Collective Fund.