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Note 15 - Equity-based Compensation (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended 13 Months Ended
Jan. 15, 2021
Nov. 17, 2020
Jul. 31, 2021
Jul. 31, 2020
Mar. 31, 2017
Oct. 31, 2007
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jul. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)               0 20,000 83,000  
Proceeds from Stock Options Exercised               $ 0 $ 7 $ 189  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value                 0 0  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total               $ 1,200      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)               2 years 3 months 14 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)               516,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)               1,528,000      
Share-based Payment Arrangement, Expense               $ 933 $ 532 $ 486  
Share-based Payment Arrangement, Nonemployee [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)               0 400,000 0  
Share-based Payment Arrangement, Expense               $ 240 $ 64 $ 37  
Share-based Payment Arrangement, Nonemployee [Member] | Partner and Senior Vice President of China Kington [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)   300,000             300,000    
Employees and Directors [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)               516,000 1,158,000 145,000  
Share-based Payment Arrangement, Option [Member]                      
Share-based Payment Arrangement, Expense               $ 700 $ 500 $ 400  
Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Nonemployee [Member] | Partner and Senior Vice President of China Kington [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   1 year                  
Share-based Payment Arrangement, Option [Member] | Messrs. Ma [Member]                      
Share-based Payment Arrangement, Expense               14      
Share-based Payment Arrangement, Option [Member] | Mr. Liu [Member]                      
Share-based Payment Arrangement, Expense               7      
Share-based Payment Arrangement, Option [Member] | Mr. Sieczkarek [Member]                      
Share-based Payment Arrangement, Expense               60      
Share-based Payment Arrangement, Option [Member] | Mr. Todd Zavodnick [Member]                      
Share-based Payment Arrangement, Expense               24      
Share-based Payment Arrangement, Option [Member] | Ms. Gail Maderis [Member]                      
Share-based Payment Arrangement, Expense               36      
Share-based Payment Arrangement, Option [Member] | Mr. Xiaopei Wang [Member]                      
Share-based Payment Arrangement, Expense               $ 17      
Restricted Stock Units (RSUs) [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)               1,200,000      
Restricted Stock Units (RSUs) [Member] | Employees and Directors [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                 160,000 0  
Restricted Stock [Member] | Share-based Payment Arrangement, Nonemployee [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)               0      
Restricted Stock [Member] | Mr. Mark Sieczkarek [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     328,359 192,983           168,000  
Share-based Payment Arrangement, Expense                     $ 400
Restricted Stock [Member] | Mr. Mark Sieczkarek [Member] | Share-based Payment Arrangement, Tranche One [Member]                      
Share-based Payment Arrangement, Expense     $ 200                
Restricted Stock [Member] | Mr. Mark Sieczkarek [Member] | Share-based Payment Arrangement, Tranche Two [Member]                      
Share-based Payment Arrangement, Expense     $ 200                
Restricted Stock [Member] | Ms. Moon and Ms. Xiao [Member]                      
Stock Issued During Period, Shares, Issued for Services (in shares)             36,000        
The 2007 Omnibus Incentive Plan [Member] | Maximum [Member] | Incentive Stock Options (ISOs) [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)           10 years          
The 2017 Omnibus Incentive Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)         2,318,486            
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase in Shares Authorized, Percentage of Outstanding Common Stock         4.00%            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) 1,671,303                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)               1,842,993      
The 2017 Omnibus Incentive Plan [Member] | Incentive Stock Options (ISOs) [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percentage of Stock Owned by Shareholder, Minimum         10.00%            
The 2017 Omnibus Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)         4 years            
The 2017 Omnibus Incentive Plan [Member] | Maximum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)         10 years            
The 2017 Omnibus Incentive Plan [Member] | Maximum [Member] | Incentive Stock Options (ISOs) [Member] | Shareholder of More Than 10% [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)         5 years            
The 2017 Omnibus Incentive Plan [Member] | Minimum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent         100.00%            
The 2017 Omnibus Incentive Plan [Member] | Minimum [Member] | Incentive Stock Options (ISOs) [Member] | Shareholder of More Than 10% [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent         110.00%