Note 12 - Related Party Transactions (Details Textual)					3 Months Ended		12 Months Ended
	Oct. 13, 2018 USD ($)	Jul. 31, 2017 USD ($)	May 26, 2017 USD ($) ft²	Jan. 09, 2013 USD ($) ft²	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)	Aug. 02, 2017 USD ($)
Lessee, Operating Lease, Liability, to be Paid, Total					$ 3,154,079
Leasehold Improvements and Furniture and Fixtures [Member]
Impairment of Long-Lived Assets to be Disposed of							$ 100,000
Outside Counsel [Member]
Legal Fees					117,000	$ 113,000
Accounts Payable, Related Parties					78,000
Dr. Eric A. Rose [Member] | Consulting Agreement [Member]
Accounts Payable, Related Parties					50,000
Consulting Agreement, Term (Year)	2 years
Related Party Transaction, Annual Amount	$ 200,000
Related Party Transaction, Expenses from Transactions with Related Party					50,000	$ 50,000
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
Monthly Rent During Initial Period			$ 25,333
Monthly Rent, Initial Period (Month)			5 years 90 days
Monthly Rent After Initial Period			$ 29,333
Monthly Facility Fee, Second Year			$ 3,333
Monthly Facility Fee, Yearly Rate Increase After Second Year			5.00%
Monthly Facility Fee, Final Year			$ 4,925
Lessee, Operating Lease, Liability, to be Paid, Total								$ 900,000
MacAndrews and Forbes Incorporated [Member] | The Old HQ Sublease [Member]
Area of Real Estate Property (Square Foot) | ft²				6,676
Monthly Rent During Initial Period				$ 60,000
Monthly Rent After Initial Period				$ 63,400
Lessee, Operating Lease, Liability, Estimate to be Paid Had No Changes Occurred					$ 2,400,000
Business Exit Costs							$ 1,100,000
MacAndrews and Forbes Incorporated [Member] | The Replacement M&F Sublease [Member]
Rent Concession Period (Month)		60 days
Monthly Rent, First Twelve Months		$ 36,996
Monthly Rent, Year Two		37,831
Monthly Rent, Thereafter		$ 38,665
MacAndrews and Forbes Incorporated [Member] | The Old HQ Sublease Termination Agreement [Member]
Lessee, Operating Lease, Liability, to be Paid, Total								1,100,000
MacAndrews and Forbes Incorporated [Member] | The New HQ Lease and Old HQ Sublease Termination Agreements [Member]
Lessee, Operating Lease, Liability, to be Paid, Total								$ 2,000,000