Note 12 - Other Income (Details Textual) - USD ($)			12 Months Ended
Aug. 09, 2017	Aug. 03, 2017	Dec. 31, 2018	Dec. 31, 2017
Proceeds from Sale of Short-term Investments		$ 56,000		$ 56,000
IP Addresses [Member]
Proceeds from Sale of Intangible Assets	$ 872,000			$ 872,000

The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

Name:	us-gaap_ProceedsFromSaleOfShortTermInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration