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Note 16 - Stock-Based Compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2021
Expected life 10 years      
Minimum        
Vesting period 3 years      
Maximum        
Vesting period 7 years      
2010 Equity Incentive Plan [Member]        
Shares of common stock authorized 350,000      
The 2013 Equity Incentive Plan [Member]        
Shares of common stock authorized 350,000      
The 2016 Equity Incentive Plan [Member]        
Shares of common stock authorized 400,000      
Remaining shares of common stock available for grant 132,375      
Employee Stock Purchase Plan        
Remaining shares of common stock available for grant       61,186
Maximum amount any one participant can elect in an offering period $ 10      
Maximum amount any one participant can contribute (as a percent) 15.00% 15.00% 15.00%  
Stock purchase price percent 85.00%