Note 8 - Accrued Liabilities
|3 Months Ended|
Mar. 31, 2019
|Notes to Financial Statements|
|Accounts Payable and Accrued Liabilities Disclosure [Text Block]||
Accrued liabilities consisted of the following:
The entire disclosure for accounts payable and accrued liabilities at the end of the reporting period.
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef