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Note 11 - FAIR VALUE MEASUREMENTS - Fair Value, Assets Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Total $ 100,927 $ 125,016
Fair Value, Inputs, Level 1 [Member]    
Total 100,927 125,016
Money Market Funds [Member]    
Money market mutual funds 65,020 12,474
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Money market mutual funds 65,020 12,474
US Government Corporations and Agencies Securities [Member]    
Short-term investments 35,907 112,542
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Short-term investments $ 35,907 $ 112,542