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Note 13 - Equity-based Compensation (Details Textual) - USD ($) $ in Thousands													1 Months Ended											3 Months Ended			6 Months Ended	12 Months Ended
	Sep. 12, 2019	Sep. 11, 2019	Jul. 20, 2019	Jul. 19, 2019	May 01, 2019	Apr. 30, 2019	Apr. 29, 2019	Apr. 28, 2019	Mar. 31, 2018	Mar. 31, 2018	May 26, 2016	Mar. 30, 2015	Sep. 30, 2019	Jul. 31, 2019	Mar. 30, 2018	Jul. 30, 2017	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010	Dec. 31, 2019	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2013	Dec. 31, 2012	Oct. 31, 2007
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period																												83,000	4,000	68,000
Proceeds from Stock Options Exercised																												$ 189	$ 11	$ 185
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value																												$ 0	$ 0	$ 116
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross																												145,000	1,118,000	1,616,000
Payments of Dividends, Total																												$ 0
Share-based Payment Arrangement, Expense																												$ 486	$ 671	$ 2,542
Employees and Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross																												145,000	1,085,000	1,529,000
Share-based Payment Arrangement, Expense																												$ 449	$ 671	$ 2,371
Nonemployees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross																												0
Share-based Payment Arrangement, Expense																												$ 37	$ 0	$ 243
Share-based Payment Arrangement, Option [Member] \| Mr. Mark Sieczkarek [Member]
Share-based Payment Arrangement, Expense														$ 60
Share-based Compensation Arrangement by Share-based Payment Award, Exercisable Period			3 years	90 days
Share-based Payment Arrangement, Option [Member] \| Chief Financial Officer [Member]
Share-based Payment Arrangement, Expense																									$ 260	$ 244
Share-based Compensation Arrangement by Share-based Payment Award, Exercisable Period																90 days											3 years
Share-based Payment Arrangement, Option [Member] \| Mr. Henry Liu [Member]
Share-based Payment Arrangement, Expense															$ 26
Share-based Compensation Arrangement by Share-based Payment Award, Exercisable Period									90 days	3 years
Share-based Payment Arrangement, Option [Member] \| Mr. Liu [Member]
Share-based Payment Arrangement, Expense							$ 14
Share-based Compensation Arrangement by Share-based Payment Award, Exercisable Period							3 years	90 days
Share-based Payment Arrangement, Option [Member] \| Mr. Yanbin Liu [Member]
Share-based Payment Arrangement, Expense					$ 7
Share-based Compensation Arrangement by Share-based Payment Award, Exercisable Period					3 years	90 days
Share-based Payment Arrangement, Option [Member] \| Mr. Todd Zavodnick [Member]
Share-based Payment Arrangement, Expense													$ 24
Share-based Compensation Arrangement by Share-based Payment Award, Exercisable Period	3 years	90 days
Share-based Payment Arrangement, Option [Member] \| Nonemployees [Member]
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued																													33,000	86,000
Employee Stock Options and RSUs [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total																								$ 491				$ 491
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition																												2 years 73 days
Fully Vested Registered Stock [Member] \| Mr. Mark Sieczkarek [Member]
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued														168,000
Fully Vested Registered Stock [Member] \| Nonemployees [Member]
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued																														31,000
Fully Vested Registered Stock [Member] \| Ms. Moon and Ms. Xiao [Member]
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued																								36,000
Restricted Stock [Member]
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued																													0
Restricted Stock [Member] \| Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period																													12,000	10,000
Restricted Stock [Member] \| Nonemployees [Member]
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued																														8,000
The 2007 Omnibus Incentive Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance																																	80,000
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Annual Increase in Shares Authorized																																40,000
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase in Shares Authorized, Percentage of Outstanding Common Stock																															4.00%	4.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized											1,124,826	82,461							32,646	59,157	40,000	37,427	37,207
Increase (Decrease) in Number of Shares Available for Grant																	610,774	139,449
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized																	2,318,486
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percentage of Stock Owned by Shareholder, Minimum																												10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																												4 years
The 2007 Omnibus Incentive Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent																												100.00%
The 2007 Omnibus Incentive Plan [Member] \| Minimum [Member] \| Shareholder of More Than 10% [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent																												110.00%
The 2007 Omnibus Incentive Plan [Member] \| Maximum [Member] \| Incentive Stock Options (ISOs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period																												10 years
The 2017 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase in Shares Authorized, Percentage of Outstanding Common Stock																								4.00%				4.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized																								2,318,486				2,318,486
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant																								1,789,174				1,789,174
The 2017 Omnibus Incentive Plan [Member] \| Incentive Stock Options (ISOs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percentage of Stock Owned by Shareholder, Minimum																												10.00%
The 2017 Omnibus Incentive Plan [Member] \| Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																												4 years
The 2017 Omnibus Incentive Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent																												100.00%
The 2017 Omnibus Incentive Plan [Member] \| Minimum [Member] \| Shareholder of More Than 10% [Member] \| Incentive Stock Options (ISOs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent																												110.00%
The 2017 Omnibus Incentive Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period																												10 years
The 2017 Omnibus Incentive Plan [Member] \| Maximum [Member] \| Shareholder of More Than 10% [Member] \| Incentive Stock Options (ISOs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period																												5 years