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Note 7 - Revenue 1 (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Coal [Member]      
Accounts Receivable, after Allowance for Credit Loss, Total     $ 12,800,000
Coal [Member] | INDIANA | Revenue from Contract with Customer Benchmark [Member] | Geographic Concentration Risk [Member]      
Concentration Risk, Percentage 74.00% 73.00%  
Electricity, Purchased [Member] | Hoosier Energy [Member]      
Long-Term Purchase Commitment, Minimum Quantity Required, Percentage 70.00%    
Long-term Purchase Commitment, Minimum Quantity Required, Price Per Megawatt Hour $ 34.00    
Long-term Purchase Commitment, Stand Ready Obligation, Contract Capacity, Megawatts Provided Year One 917    
Long-term Purchase Commitment, Stand Ready Obligation, Contract Capacity, Megawatts Provided Year Two Through Four 300    
Long-term Purchase Commitment, Stand Ready Obligation, Contract Capacity, Price Per Kilowatts-month $ 5.80