v3.19.3
Note 11 - Related-party Transactions (Details Textual) - USD ($)
May 03, 2019
Jun. 30, 2019
Dec. 31, 2018
Chief Executive Officer [Member] | Severance Pay [Member]      
Related Party Transaction, Amounts of Transaction $ 1,091,000    
Majority Investors [Member]      
Notes Payable, Related Parties   $ 5,500,000  
Debt Instrument, Face Amount     $ 4,500,000
Debt Instrument, Interest Rate, Stated Percentage     8.00%
Interest Payable     $ 126,000