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Note 7 - Debt, Credit Facility and Leases (Details Textual) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jul. 31, 2018
Revolving Credit Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity       $ 250,000
Long-Term Line of Credit, Total $ 0 $ 0    
Letters of Credit Outstanding, Amount $ 17,300      
Letter of Credit [Member]        
Letter of Credit Outstanding, Fronting Fee       0.20%
Letter of Credit [Member] | Minimum [Member]        
Letter of Credit, Participation Fee, Percent       2.25%
Letter of Credit [Member] | Maximum [Member]        
Letter of Credit, Participation Fee, Percent       4.00%
Senior Notes [Member] | The 2028 Senior Notes [Member]        
Debt Instrument, Interest Rate, Stated Percentage   7.25% 7.25%