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Note 7 - Operating Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Weighted-average remaining lease term (years) (Year) 2 years 7 months 6 days 3 years 3 months 18 days
Weighted-average discount rate 4.50% 4.50%
Other Noncurrent Assets [Member]    
Operating lease right-of-use asset $ 1,711 $ 2,189
Accrued Expenses and Other Current Liabilities [Member]    
Current operating lease liability 657 680
Other Noncurrent Liabilities [Member]    
Operating lease liability, net of current portion 1,086 1,524
Accrued Expenses and Other Current Liabilites and Other Noncurrent Liabilities [Member]    
Total operating lease liability $ 1,743 $ 2,204