Note 6 - Note Payable (Tables)
|3 Months Ended|
Mar. 31, 2021
|The 2017 Loan Agreement [Member]|
|Schedule of Debt [Table Text Block]||
Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation.
No definition available.