Note 11 - Blockchain Software Application Platform Development Costs (Details Textual) $ in Thousands, ¥ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2018 CNY (¥)	Feb. 28, 2018 USD ($)
Payment for Blockchain Technology Based Applications Development Costs	$ 3,738
Contract to Develop Blockchain Technology Based Applications [Member]
Application Development Contracts, Contract Amount					$ 4,500
Contract to Develop Social Network Based Applications [Member]
Application Development Contracts, Contract Amount			$ 440	¥ 3