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Note 8 - Incentive Plans (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended
Sep. 30, 2020
Aug. 21, 2020
Sep. 30, 2019
Aug. 21, 2020
Sep. 30, 2020
Sep. 30, 2019
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         $ 0  
Share-based Payment Arrangement, Expense $ 14,508  
Share-based Payment Arrangement, Option [Member]            
Share-based Payment Arrangement, Expense 14,500          
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount $ 4,800       $ 4,800  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 2 years