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Note 8 - Incentive Plans (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended 8 Months Ended 12 Months Ended
Nov. 30, 2020
Sep. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Aug. 21, 2020
Dec. 31, 2020
Dec. 31, 2019
Share-based Payment Arrangement, Expense $ 302,000   $ 1,023,000 $ 0   $ 15,776,000 $ 1,989,000 $ 0 $ 0   $ 0
Each Outside Director [Member]                      
Stock Issued During Period, Shares, Issued for Services (in shares) 12,500                    
Outside Directors [Member]                      
Share-based Payment Arrangement, Expense $ 302,000                    
Stock Issued During Period, Shares, Issued for Services (in shares) 62,500                    
Share-based Payment Arrangement, Option [Member]                      
Share-based Payment Arrangement, Expense           15,500,000 1,900,000 0      
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount     $ 1,900,000   $ 3,800,000 $ 3,800,000 $ 1,900,000     $ 3,800,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   2 years                  
The 401K Plan [Member]                      
Defined Contribution Plan, Period of Employment for Eligibility (Month)             3 months     3 months  
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent             80.00%     80.00%  
Defined Contribution Plan, Employer Matching Contribution, Percent of Match             100.00%     100.00%  
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay             4.00%     4.00%  
Defined Contribution Plan, Employer Discretionary Contribution Amount         $ 49,000   $ 111,000 $ 0