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Note 15 - Leases (Details Textual)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
May 26, 2017
ft²
Lessee, Operating Lease, First Renewal Term (Year)         2 years  
Lessee, Operating Lease, Second Renewal Term (Year)         3 years  
Operating Lease, Cost $ 100,000 $ 100,000 $ 300,000 $ 300,000    
Operating Lease, Payments $ 100,000 $ 100,000 $ 300,000 $ 300,000    
Operating Lease, Weighted Average Remaining Lease Term (Year) 5 years 11 months 12 days   5 years 11 months 12 days      
Operating Lease, Weighted Average Discount Rate, Percent 4.53%   4.53%      
Operating Lease, Liability, Total $ 2,587,180   $ 2,587,180      
Other Liabilities [Member]            
Operating Lease, Liability, Total $ 2,200,000   $ 2,200,000      
MacAndrews and Forbes Incorporated [Member] | The New HQ Lease [Member]            
Lessee, Operating Lease, Term of Contract (Year)           10 years
Area of Real Estate Property (Square Foot) | ft²           3,200