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Current and Long-Term Financing (Debt Schedule) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Current portion of borrowings outstanding $ 3,649 $ 2,527
Long-term portion of borrowings outstanding 16,019 18,183
NACoal    
Debt Instrument [Line Items]    
Revolving credit agreement 0 4,000
Other debt 19,668 16,710
Total debt outstanding 19,668 20,710
Current portion of borrowings outstanding 3,649 2,527
Long-term portion of borrowings outstanding 16,019 18,183
Total available borrowings, net of limitations, under revolving credit agreement 116,285 120,231
Unused revolving credit agreement $ 116,285 $ 116,231
Weighted average stated interest rate on total borrowings 3.90% 3.70%