Note 2 - Summary of Significant Accounting - Estimated Useful Lives of Property and Equipment (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2016 | |
| Office Furniture and Equipment [Member] | |
| Property and equipment, useful life (Year) | 5 years |
| Computer Equipment [Member] | |
| Property and equipment, useful life (Year) | 3 years |
| Survey and Field Equipment [Member] | |
| Property and equipment, useful life (Year) | 5 years |
| Leasehold Improvements [Member] | |
| Property and equipment, useful life | Lesser of the estimated useful lives or remaining term of the lease |