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Note 3 - Loan to Affiliate (Details Textual) - Senior Secured Term Loan [Member] - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 19, 2019
Notes Receivable, Related Parties         $ 2,000,000
Notes Receivable, Interest Rate         14.00%
Interest Income, Related Party $ 71,000 $ 71,000 $ 142,000 $ 80,000  
The Lenders [Member]          
Notes Receivable, Related Parties         $ 10,500,000