Note 7 - Other Current Assets, Net (Details Textual) ¥ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)
Accounts Receivable, Allowance for Credit Loss, Ending Balance	$ 2,340,000	$ 760,000
Accounts Receivable, Credit Loss Expense (Reversal)	2,335,000	1,523,000
Internet Advertising And TV Advertising Contractual Deposit [Member]
Accounts Receivable, Allowance for Credit Loss, Ending Balance		1,620,000	¥ 11
Accounts Receivable, Credit Loss Expense (Reversal)	900,000	800,000
Short-term Working Capital Loan to an Unrelated Third Party [Member]
Financing Receivable, after Allowance for Credit Loss, Total		$ 150,000	¥ 1
Accounts Receivable, Credit Loss Expense (Reversal)	$ 150,000