Note 11 - Blockchain Platform Applications Development Costs (Details Textual) $ in Thousands, ¥ in Millions	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2018 CNY (¥)	Feb. 28, 2018 USD ($)
Payment for Blockchain Technology Based Applications Development Costs	$ 3,880	$ 3,730
Contract to Develop Blockchain Technology Based Applications [Member]
Application Development Contracts, Contract Amount	$ 4,930				$ 4,500
Contract to Develop Social Network Based Applications [Member]
Application Development Contracts, Contract Amount			$ 430	¥ 3