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Note 8 - Incentive Plans (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Nov. 30, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Share-based Payment Arrangement, Expense $ 302,000 $ 966,000  
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   966,000 0  
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount   $ 2,900,000   $ 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)   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   $ 56,000 $ 0