Note 11 - Blockchain Application Platform Development Costs (Details Textual) $ in Thousands, ¥ in Millions	9 Months Ended		20 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2018 CNY (¥)	Feb. 28, 2018 USD ($)
Payment for Blockchain Technology Based Applications Development Costs		$ 3,743	$ 3,710
Contract to Develop Blockchain Technology Based Applications [Member]
Application Development Contracts, Contract Amount	$ 4,920		$ 4,920			$ 4,500
Contract to Develop Social Network Based Applications [Member]
Application Development Contracts, Contract Amount				$ 440	¥ 3