Note 1 - Nature of Business and Significant Accounting Policies - Property, Building and Equipment Useful Life (Details)	12 Months Ended
Dec. 31, 2018
Furniture and Equipment [Member] \| Minimum [Member]
Useful life (Year)	5 years
Furniture and Equipment [Member] \| Maximum [Member]
Useful life (Year)	7 years
Land Improvements [Member]
Useful life (Year)	15 years

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration