Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Marketable Securities (Details Textual)

v3.20.2
Note 4 - Marketable Securities (Details Textual) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Accrued Interest Receivable On Available For Sale Securities [Member]    
Interest Receivable $ 18,000 $ 25,000