Note 6 - Notes Payable (Tables)
|12 Months Ended|
Dec. 31, 2018
|Schedule of Long-term Debt Instruments [Table Text Block]||
Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef