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Note 25 - Subsequent Events (Details Textual) $ / shares in Units, ¥ in Millions			1 Months Ended				12 Months Ended
	Dec. 14, 2020 USD ($) $ / shares shares	Aug. 07, 2019 $ / shares shares	Mar. 31, 2021 USD ($) $ / shares shares	Feb. 28, 2021 USD ($) $ / shares shares	Jan. 31, 2021 USD ($)	Jan. 31, 2021 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Share-based Payment Arrangement, Expense \| $							$ 2,152,000	$ 393,000
Private Placement [Member]
Stock Issued During Period, Shares, New Issues (in shares) \| shares	4,320,989	3,216,860
Shares Issued, Price Per Share (in dollars per share) \| $ / shares	$ 1.62	$ 1.4927
Proceeds from Issuance or Sale of Equity, Total \| $	$ 7,000,000						$ 7,000,000
Subsequent Event [Member] \| The 2020 Omnibus Securities and Incentive Plan [Member]
Stock Issued During Period, Shares, New Issues (in shares) \| shares			30,000
Share Price (in dollars per share) \| $ / shares			$ 3.13
Share-based Payment Arrangement, Expense \| $			$ 90,000
Subsequent Event [Member] \| Unregistered Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) \| shares				2,606,000
Warrants and Rights Outstanding, Term (Year)				3 years 182 days
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares				$ 3.59
Subsequent Event [Member] \| Private Placement [Member]
Stock Issued During Period, Shares, New Issues (in shares) \| shares				5,212,000
Shares Issued, Price Per Share (in dollars per share) \| $ / shares				$ 3.59
Proceeds from Issuance or Sale of Equity, Total \| $				$ 18,700,000
Subsequent Event [Member] \| Xiao Peng Education [Member] \| Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Equity Method Investment, Ownership Percentage					17.00%	17.00%
Payments to Acquire Equity Method Investments					$ 460,000	¥ 3.0
Subsequent Event [Member] \| Guangzhou Gongxiang Technology Co. [Member] \| Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Equity Method Investment, Ownership Percentage					15.00%	15.00%
Payments to Acquire Equity Method Investments					$ 230,000	¥ 1.5