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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Note 12 - Equity-based Compensation (Details Textual) - USD ($) $ in Thousands					1 Months Ended								3 Months Ended		6 Months Ended	9 Months Ended
	Mar. 21, 2018	Mar. 20, 2018	May 26, 2016	Mar. 30, 2015	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2013	Dec. 31, 2012	Oct. 31, 2007
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period														51	4,000	4,000	51,000
Proceeds from Stock Options Exercised														$ 129	$ 11	$ 11	$ 129
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value																$ 0	108
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross																852,000
Allocated Share-based Compensation Expense, Total													$ 168	940		$ 508	2,628
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense													0	0		$ 0	$ 0
Employees and Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross																819,000	1,407,000
Allocated Share-based Compensation Expense, Total													163	779		$ 490	$ 2,379
Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period																12,000	0
Chief Financial Officer [Member]
Allocated Share-based Compensation Expense, Total																$ 243
Mr. Liu [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	3 years	90 days
Allocated Share-based Compensation Expense, Total																26
Nonemployees [Member]
Allocated Share-based Compensation Expense, Total													5	$ 161		$ 18	$ 250
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued																32,000	86,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares																0
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																4 years
Employee Stock Options and RSUs [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total													$ 1,800			$ 1,800
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition																90 days
Fully Vested Registered Stock [Member] \| Nonemployees [Member]
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued																	31,000
Restricted Stock [Member] \| Nonemployees [Member]
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued																	8
The 2007 Omnibus Incentive Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance																				40,000
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 Additional Shares Authorized					615,392
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													1,384,152			1,384,152
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] \| 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