Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
Note 5 - Marketable Securities - Fair Value of Marketable Securities (Details) - Fair Value, Recurring [Member]
$ in Thousands
Sep. 30, 2019
USD ($)
Total marketable securities $ 5,002
Fair Value, Inputs, Level 1 [Member]  
Total marketable securities
Fair Value, Inputs, Level 2 [Member]  
Total marketable securities 5,002
Fair Value, Inputs, Level 3 [Member]  
Total marketable securities
Commercial Paper and Corporate Bonds [Member]  
Total marketable securities 2,000
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 2,000
Commercial Paper and Corporate Bonds [Member] | Fair Value, Inputs, Level 3 [Member]  
Total marketable securities
US Government Agencies Debt Securities [Member]  
Total marketable securities 3,002
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 3,002
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]  
Total marketable securities