Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Fair Value Measurements and Financial Instruments - Assets Measured on a Recurring Basis (Details)

v3.22.1
Note 7 - Fair Value Measurements and Financial Instruments - Assets Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Assets, fair value $ 69,232 $ 78,834
Fair Value, Inputs, Level 1 [Member]    
Assets, fair value 0 0
Fair Value, Inputs, Level 2 [Member]    
Assets, fair value 69,232 78,834
Fair Value, Inputs, Level 3 [Member]    
Assets, fair value 0 0
Money Market Accounts [Member]    
Assets, fair value 13,600 17,974
Money Market Accounts [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, fair value 0 0
Money Market Accounts [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, fair value 13,600 17,974
Money Market Accounts [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, fair value 0 0
Money Market Funds [Member]    
Assets, fair value 15,802 15,801
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, fair value 0 0
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, fair value 15,802 15,801
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, fair value 0 0
Bank Time Deposits [Member]    
Assets, fair value 7,310 5,045
Bank Time Deposits [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, fair value 0 0
Bank Time Deposits [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, fair value 7,310 5,045
Bank Time Deposits [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, fair value 0 0
Canada Treasury Securities [Member]    
Assets, fair value 12,494  
Canada Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, fair value 0  
Canada Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, fair value 12,494  
Canada Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, fair value 0  
Commercial Notes [Member]    
Assets, fair value   19,998
Commercial Notes [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, fair value   0
Commercial Notes [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, fair value   19,998
Commercial Notes [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, fair value   0
Corporate Debt Securities [Member]    
Assets, fair value 20,026  
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, fair value 0  
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, fair value 20,026  
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, fair value  
Guaranteed Investment Certificate [Member]    
Assets, fair value   20,016
Guaranteed Investment Certificate [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, fair value   0
Guaranteed Investment Certificate [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, fair value   20,016
Guaranteed Investment Certificate [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, fair value   $ 0