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Note 1 - Nature of the Business and Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) 87,543 13,383 97,620 31,734
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation $ 1.0 $ 0.6 $ 1.6 $ 1.3
Amortization of Debt Issuance Costs     0.8  
Fees Associated with Debt Modification 0.8      
Other Noncurrent Assets [Member]        
Debt Issuance Costs, Net, Total 1.1   1.1  
Other Current Assets [Member]        
Debt Issuance Costs, Net, Total 0.3   0.3  
Draw Term Loan [Member]        
Amortization of Debt Issuance Costs     $ 0.6  
Payments of Debt Restructuring Costs $ 0.6