Note 15 - Leases (Details Textual)	3 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	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
Operating Lease, Payments	$ 100,000	$ 100,000
Operating Lease, Weighted Average Remaining Lease Term (Year)	6 years 36 days
Operating Lease, Weighted Average Discount Rate, Percent	4.53%
Operating Lease, Liability, Total	$ 2,704,598
Other Liabilities [Member]
Operating Lease, Liability, Total	$ 2,300,000
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