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Note 7 - EMPLOYEE BENEFIT PLANS - Other (Details)
1 Months Ended 3 Months Ended 6 Months Ended 15 Months Ended 128 Months Ended
Jun. 15, 2021
Nov. 16, 2011
shares
Jul. 31, 2001
Jul. 31, 2001
item
Jun. 30, 2022
USD ($)
$ / shares
shares
Jun. 30, 2021
shares
Jun. 30, 2022
USD ($)
$ / shares
shares
Jun. 30, 2021
$ / shares
shares
Jun. 30, 2022
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
shares
Dec. 31, 2001
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Cumulative Forfeitures of Plan (in shares)             4,000          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)         133,000   133,000   133,000 133,000 226,000  
Share Price (in dollars per share) | $ / shares         $ 21.51   $ 21.51   $ 21.51 $ 21.51    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $             $ 1,500,000          
Share-based Payment Arrangement, Option [Member]                        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $         $ 100,000   $ 100,000   $ 100,000 $ 100,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             1 year 3 months 18 days          
Restricted Stock Units (RSUs) [Member]                        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $         24,800,000   $ 24,800,000   $ 24,800,000 24,800,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             2 years 3 months 18 days          
Employee Stock Purchase Plan [Member]                        
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)                 0      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)             4 years          
The 2010 Purchase Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate     10.00% 10.00%                
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent     85.00%                  
Share-based Compensation Arrangement by Share-based Payment Award, Offering Period       24 months                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Purchase Period | item       4                
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)             5,203 99,674        
Employee Stock Purchase Plan Weighted Average Purchase Price of Shares Purchased (in dollars per share) | $ / shares             $ 13.40 $ 9.24        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $         0   $ 0   $ 0 0    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       6 months                
The 2021 Purchase Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Offering Period 24 months                      
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)             90,040          
Employee Stock Purchase Plan Weighted Average Purchase Price of Shares Purchased (in dollars per share) | $ / shares             $ 15.90          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $         $ 1,500,000   $ 1,500,000   $ 1,500,000 $ 1,500,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             1 year 2 months 12 days          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 10 years                      
Common Stock, Capital Shares Reserved for Future Issuance (in shares)         909,960   909,960   909,960 909,960    
Twenty Eleven Stock Incentive Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   12,800,000                    
Share Based Compensation Arrangement By Share Based Payment Award Shares Reserved Decrease Rate (in shares)   1.33                    
Common Stock, Capital Shares Reserved for Future Issuance (in shares)         13,300,000   13,300,000   13,300,000 13,300,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)         4,500,000   4,500,000   4,500,000 4,500,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Cumulative Forfeitures of Plan (in shares)                   500,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)         0 0 0 0        
Twenty Eleven Stock Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   10 years                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   4 years                    
Shares Previously Issued Under the 2001 Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)                       3,500,000
Outside of the 2011, 2001 or IDS Plans [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)         0   0   0 0