XML 34 R25.htm IDEA: XBRL DOCUMENT v3.19.2
Note 2 - Restricted Cash (Details Textual) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Restricted Cash, Current $ 104,424
Cash Held By Qualified Intermediary [Member]    
Restricted Cash, Current 103,975  
Interest Earned on Cash Held by a Qualified Intermediary [Member]    
Restricted Cash, Current $ 449