Note 9 - Income Taxes (Details Textual) - USD ($)		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets, Gross, Total		$ 27,065,686	$ 18,129,187
Deferred Tax Liabilities, Gross, Total		331,231	305,619
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ 8,891,978	$ 1,691,536
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	21.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ (5,900,000)
Operating Loss Carryforwards, Total		$ 84,700,000
Operating Loss Carryforwards, Beginning Expiration Year		2035
Accounting Standards Update 2016-02 [Member]
Deferred Tax Assets, Gross, Total		$ 174,963
Deferred Tax Liabilities, Gross, Total		193,872
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ (18,909)