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Note 3 - Investments and Fair Value Measurements - Fair Value Hierarchy for Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Total assets $ 17 $ 1,594
Certificate of deposit - restricted cash   523
Certificate of deposit - restricted investment (1) [1]   400
Convertible notes receivable   655
Fair Value, Inputs, Level 1 [Member]    
Total assets 17 939
Certificate of deposit - restricted cash   523
Certificate of deposit - restricted investment (1) [1]   400
Convertible notes receivable  
Fair Value, Inputs, Level 2 [Member]    
Total assets
Certificate of deposit - restricted cash  
Certificate of deposit - restricted investment (1) [1]  
Convertible notes receivable  
Fair Value, Inputs, Level 3 [Member]    
Total assets 655
Certificate of deposit - restricted cash  
Certificate of deposit - restricted investment (1) [1]  
Convertible notes receivable   655
Money Market Funds [Member]    
Money market securities 17 16
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Money market securities 17 16
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]    
Money market securities
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]    
Money market securities
[1] Investment is a 12-month certificate of deposit classified as available for sale and included in Deposits and other assets on the balance sheet.