Note 3 - Recently-Adopted Accounting Pronouncements (Tables)
|6 Months Ended|
Jun. 30, 2019
|Assets and Liabilities, Lessee [Table Text Block]||
|Lessee, Operating Lease, Liability, Maturity [Table Text Block]||
Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position.
Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef