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Note 10 - Series B Mandatorily Redeemable Preferred Stock (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Interest Expense, Total $ 2,273,355 $ 2,491,870 $ 4,827,202 $ 5,037,073 $ 10,649,646 $ 13,041,016
Redeemable Convertible Preferred Stock Series B [Member]            
Stock Redeemed or Called During Period, Shares (in shares)         16,900 13,800
Stock Redeemed or Called During Period, Value         $ 16,900,000 $ 13,800,000
Preferred Stock, Shares Outstanding, Ending Balance (in shares) 0   0   0 16,900
Interest Expense, Total   $ 61,000   $ 122,000 $ 122,000 $ 147,000
Unamortized Deferred Stock Costs $ 0   $ 0   $ 0 $ 122,000