Note 4 - Prepaid Expenses (Tables)
|12 Months Ended|
Dec. 31, 2020
|Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]||
Tabular disclosure of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer; the aggregate carrying amount of current assets, not separately presented elsewhere in the balance sheet; and other deferred costs.
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef