Note 6 - Accrued Expenses (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2020

Dec. 31, 2019

Notes Tables

Schedule of Accrued Liabilities [Table Text Block]

	March 31, 2020		December 31, 2019
Accrued management salaries	$	1,418,797	$	1,323,483
Accrued directors’ fees		436,920		409,219
Other accrued expenses		61,708		118,338
Total accrued expenses	$	1,917,425	$	1,851,040

	2019		2018
Accrued management salaries	$	1,323,483	$	924,509
Accrued directors’ fees		409,219		295,670
Other accrued expenses		118,338		18,373
Total accrued expenses	$	1,851,040	$	1,238,552