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Note 8 - Incentive Plans (Details Textual) - USD ($)
1 Months Ended 4 Months Ended 8 Months Ended 12 Months Ended
Nov. 30, 2020
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2020
Aug. 21, 2020
Dec. 31, 2020
Dec. 31, 2019
Share-based Payment Arrangement, Expense $ 302,000   $ 15,776,000    
Each Outside Director [Member]              
Stock Issued During Period, Shares, Issued for Services (in shares) 12,500            
Outside Directors [Member]              
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        
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount     $ 3,800,000 $ 3,800,000   $ 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)           90 days  
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent           80.00%  
Defined Contribution Plan, Employer Matching Contribution, Percent of Match           100.00%  
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay           4.00%  
Defined Contribution Plan, Employer Discretionary Contribution Amount       $ 49,000