Annual report pursuant to Section 13 and 15(d)

Note 5 - Marketable Securities - Fair Value of Marketable Securities (Details)

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Note 5 - Marketable Securities - Fair Value of Marketable Securities (Details) - Fair Value, Recurring [Member]
$ in Thousands
Dec. 31, 2019
USD ($)
Total marketable securities $ 3,995
Fair Value, Inputs, Level 1 [Member]  
Total marketable securities
Fair Value, Inputs, Level 2 [Member]  
Total marketable securities 3,995
Fair Value, Inputs, Level 3 [Member]  
Total marketable securities
Commercial Paper and Corporate Bonds [Member]  
Total marketable securities 1,997
Commercial Paper and Corporate Bonds [Member] | Fair Value, Inputs, Level 1 [Member]  
Total marketable securities
Commercial Paper and Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]  
Total marketable securities 1,997
Commercial Paper and Corporate Bonds [Member] | Fair Value, Inputs, Level 3 [Member]  
Total marketable securities
US Government Agencies Debt Securities [Member]  
Total marketable securities 1,998
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]  
Total marketable securities
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]  
Total marketable securities 1,998
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]  
Total marketable securities