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Note 14 - Debt (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 15, 2022
Apr. 06, 2021
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Feb. 03, 2022
Feb. 02, 2022
Property, Plant and Equipment, Net, Total       $ 56,038,000 $ 54,871,000      
Debt Conversion, Converted Instrument, Amount       0 100,000 $ 250,000    
Proceeds from Issuance of Commercial Paper       3,200,000        
Repayments of Commercial Paper       $ 3,400,000        
Commercial Paper, Maturity Duration, Minimum (Day)       7 days        
Commercial Paper Maturity Duration, Maximum (Year)       88 years        
Commercial Paper       $ 200,000 400,000      
Board of Directors Authorized Debt Issuance             $ 12,000,000  
Previous Board of Directors Remaining Debt Issuance               $ 2,500,000
Board of Directors Remaining Debt Issuance       6,600,000        
Long-Term Debt, Gross       35,101,000        
Secured Debt [Member]                
Long-Term Debt, Gross       100,000 300,000      
Revolving Credit Facility [Member]                
Line of Credit Facility, Remaining Borrowing Capacity     $ 2,000,000 2,000,000        
Long-Term Line of Credit, Total       0        
Allowable Debt Per Debt to Net Worth Coverage Ratio as Defined Facility       46,900,000        
Outstanding Debt as Defined by Facility       35,100,000        
Cross Default Provision as Defined By Facility       $ 150,000        
Line of Credit Facility, Expiration Date     Jun. 08, 2023 May 20, 2027        
Conversion of Existing Notes [Member]                
Debt Conversion, Original Debt, Amount   $ 1,700,000            
Payment of Financing and Stock Issuance Costs, Total   257,000            
Gain (Loss) on Extinguishment of Debt, Total   $ 0            
Debt Conversion, Converted Instrument, Issuance Date   Apr. 06, 2021            
Conversion of Existing Notes [Member] | Interest Expense [Member]                
Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction   $ 13,000            
Conversion of Existing Notes into New 2036 Notes [Member]                
Debt Conversion, Converted Instrument, Amount   $ 701,000            
Debt Conversion, Converted Instrument, Rate   2.891%            
Debt Conversion, Converted Instrument, Expiration or Due Date   Apr. 06, 2036            
Conversion of Existing Notes into New 2071 Notes [Member]                
Debt Conversion, Converted Instrument, Amount   $ 1,000,000            
Debt Conversion, Converted Instrument, Rate   3.799%            
Debt Conversion, Converted Instrument, Expiration or Due Date   Apr. 06, 2071            
Existing Notes [Member]                
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total   $ 14,000            
4.163% Notes, Due July 15, 2022 [Member]                
Debt Instrument, Repurchase Amount $ 750,000              
Debt Instrument, Interest Rate, Stated Percentage 4.163%              
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 100.00%              
Debt Instrument, Repurchase Date Apr. 15, 2022              
4.950% Notes, Due September 9, 2052 [Member]                
Debt Instrument, Interest Rate, Stated Percentage       4.95%        
Debt Conversion, Converted Instrument, Expiration or Due Date       Sep. 09, 2052        
Equipment [Member]                
Property, Plant and Equipment, Net, Total       $ 8,004,000 7,747,000      
Asset Pledged as Collateral [Member] | Equipment [Member]                
Property, Plant and Equipment, Net, Total       $ 903,000 $ 1,200,000