v3.25.2
Note 10 - Stock-based Compensation (Details Textual)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
Share-Based Payment Arrangement, Nonemployee [Member]        
Share-Based Payment Arrangement, Expense $ 0   $ 0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) | shares 667   667  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 33.75   $ 33.75  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value $ 0   $ 0  
Share-Based Payment Arrangement, Nonemployee [Member] | Share-Based Payment Arrangement, Option [Member]        
Share-Based Payment Arrangement, Expense     $ 0 $ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period After Term Ends (Year)     90 years  
Share-Based Payment Arrangement, Employee [Member]        
Share-Based Payment Arrangement, Expense $ 0 $ 9 $ 0 $ 26
The 2016 Equity Plan [Member]        
Percent of Shares Authorized Under Plan, Aggregate Shares Issued and Outstanding 12.5   12.5  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | shares 2,086,655   2,086,655