Applied Optoelectronics (AAOI) 10-Q 6 Aug 20 2020 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2020	Jul. 31, 2020
Document Information [Line Items]
Entity Central Index Key	0001158114
Entity Registrant Name	APPLIED OPTOELECTRONICS, INC.
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2020
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity File Number	001-36083
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	76-0533927
Entity Address, Address Line One	13139 Jess Pirtle Blvd.
Entity Address, City or Town	Sugar Land
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77478
City Area Code	281
Local Phone Number	295-1800
Title of 12(b) Security	Common Stock, Par value $0.001
Trading Symbol	AAOI
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		22,773,963

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current Assets
Cash and cash equivalents	$ 51,131	$ 59,977
Restricted cash	7,778	7,051
Accounts receivable - trade, net of allowance of $30 and $30, respectively	50,029	34,655
Inventories	97,251	85,028
Prepaid income tax	210	224
Prepaid expenses and other current assets	6,610	5,869
Total current assets	213,009	192,804
Property, plant and equipment, net	244,126	248,444
Land use rights, net	5,455	5,598
Operating right of use asset	7,552	7,768
Financing right of use asset	104	119
Intangible assets, net	4,006	4,081
Deferred income tax assets	2,136	7,287
Other assets, net	1,703	724
TOTAL ASSETS	478,091	466,825
Current liabilities
Current portion of notes payable and long-term debt	42,234	33,371
Accounts payable	51,154	32,828
Bank acceptance payable	9,866	6,310
Current lease liability - operating	941	965
Current lease liability - financing	17	17
Accrued liabilities	15,557	17,864
Total current liabilities	119,769	91,355
Notes payable and long-term debt, less current portion	15,542	16,552
Convertible senior notes	77,439	77,041
Non-current lease liability - operating	7,795	7,983
Non-current lease liability - financing	91	100
TOTAL LIABILITIES	220,636	193,031
Stockholders' equity:
Preferred Stock; 5,000 shares authorized at $0.001 par value; no shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively	0	0
Common Stock; 45,000 shares authorized at $0.001 par value; 21,941 and 20,141 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively	22	20
Additional paid-in capital	323,405	303,401
Accumulated other comprehensive (loss) and income	(518)	430
Accumulated deficit	(65,454)	(30,057)
TOTAL STOCKHOLDERS' EQUITY	257,455	273,794
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 478,091	$ 466,825

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) shares in Thousands, $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts receivable, allowance	$ 30	$ 30
Preferred stock, shares authorized (in shares)	5,000	5,000
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, shares authorized (in shares)	45,000	45,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares issued (in shares)	21,941	20,141
Common stock, shares outstanding (in shares)	21,941	20,141

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue, net	$ 65,222	$ 43,411	$ 105,689	$ 96,130
Cost of goods sold	51,486	32,873	85,615	73,241
Gross profit	13,736	10,538	20,074	22,889
Operating expenses
Research and development	10,803	11,151	21,361	22,336
Sales and marketing	3,430	2,331	6,366	4,926
General and administrative	10,611	10,884	21,249	21,324
Total operating expenses	24,844	24,366	48,976	48,586
Loss from operations	(11,108)	(13,828)	(28,902)	(25,697)
Other income (expense)
Interest income	47	310	194	382
Interest expense	(1,489)	(1,490)	(2,944)	(2,486)
Other income (expense), net	974	451	1,231	296
Total other income (expense), net	(468)	(729)	(1,519)	(1,808)
Loss before income taxes	(11,576)	(14,557)	(30,421)	(27,505)
Income tax benefit (expense)	(7,024)	3,191	(4,976)	5,665
Net loss	$ (18,600)	$ (11,366)	$ (35,397)	$ (21,840)
Net loss per share
Basic (in dollars per share)	$ (0.89)	$ (0.57)	$ (1.72)	$ (1.10)
Diluted (in dollars per share)	$ (0.89)	$ (0.57)	$ (1.72)	$ (1.10)
Weighted average shares used to compute net loss per share:
Basic (in shares)	20,858,450	19,931,745	20,533,417	19,897,602
Diluted (in shares)	20,858,450	19,931,745	20,533,417	19,897,602

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net loss	$ (18,600)	$ (11,366)	$ (35,397)	$ (21,840)
Loss (gain) on foreign currency translation adjustment	1,454	(3,329)	(948)	(981)
Comprehensive loss	$ (17,146)	$ (14,695)	$ (36,345)	$ (22,821)

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2018	0	19,810
Balance at Dec. 31, 2018	$ 0	$ 20	$ 292,480	$ 602	$ 35,992	$ 329,094
Stock options exercised, net of shares withheld for employee tax (in shares)	0	0
Stock options exercised, net of shares withheld for employee tax	$ 0	$ 0	7	0	0	7
Issuance of restricted stock, net of shares withheld for employee tax (in shares)	0	141
Issuance of restricted stock, net of shares withheld for employee tax	$ 0	$ 0	(526)	0	0	(526)
Share-based compensation	0	0	5,961	0	0	5,961
Foreign currency translation adjustment	0	0	0	(981)	0	(981)
Net loss	$ 0	$ 0	0	0	(21,840)	(21,840)
Balance (in shares) at Jun. 30, 2019	0	19,951
Balance at Jun. 30, 2019	$ 0	$ 20	297,922	(379)	14,152	311,715
Balance (in shares) at Mar. 31, 2019	0	19,888
Balance at Mar. 31, 2019	$ 0	$ 20	295,130	2,950	25,518	323,618
Issuance of restricted stock, net of shares withheld for employee tax (in shares)	0	63
Issuance of restricted stock, net of shares withheld for employee tax	$ 0	$ 0	(227)	0	0	(227)
Share-based compensation	0	0	3,019	0	0	3,019
Foreign currency translation adjustment	0	0	0	(3,329)	0	(3,329)
Net loss	$ 0	$ 0	0	0	(11,366)	(11,366)
Balance (in shares) at Jun. 30, 2019	0	19,951
Balance at Jun. 30, 2019	$ 0	$ 20	297,922	(379)	14,152	311,715
Balance (in shares) at Dec. 31, 2019	0	20,140
Balance at Dec. 31, 2019	$ 0	$ 20	303,401	430	(30,057)	273,794
Public offering of common stock, net (in shares)	0	1,582
Public offering of common stock, net	$ 0	$ 2	13,928	0	0	$ 13,930
Stock options exercised, net of shares withheld for employee tax (in shares)	0	0				1
Stock options exercised, net of shares withheld for employee tax	$ 0	$ 0	3	0	0	$ 3
Issuance of restricted stock, net of shares withheld for employee tax (in shares)	0	218
Issuance of restricted stock, net of shares withheld for employee tax	$ 0	$ 0	(467)	0	0	(467)
Share-based compensation	0	0	6,540	0	0	6,540
Foreign currency translation adjustment	0	0	0	(948)	0	(948)
Net loss	$ 0	$ 0	0	0	(35,397)	(35,397)
Balance (in shares) at Jun. 30, 2020	0	21,940
Balance at Jun. 30, 2020	$ 0	$ 22	323,405	(518)	(65,454)	257,455
Balance (in shares) at Mar. 31, 2020	0	20,249
Balance at Mar. 31, 2020	$ 0	$ 20	306,305	(1,972)	(46,854)	257,499
Public offering of common stock, net (in shares)	0	1,578
Public offering of common stock, net	$ 0	$ 2	14,002	0	0	14,004
Stock options exercised, net of shares withheld for employee tax (in shares)	0	0
Stock options exercised, net of shares withheld for employee tax	$ 0	$ 0	3	0	0	3
Issuance of restricted stock, net of shares withheld for employee tax (in shares)	0	113
Issuance of restricted stock, net of shares withheld for employee tax	$ 0	$ 0	(207)	0	0	(207)
Share-based compensation	0	0	3,302	0	0	3,302
Foreign currency translation adjustment	0	0	0	1,454	0	1,454
Net loss	$ 0	$ 0	0	0	(18,600)	(18,600)
Balance (in shares) at Jun. 30, 2020	0	21,940
Balance at Jun. 30, 2020	$ 0	$ 22	$ 323,405	$ (518)	$ (65,454)	$ 257,455

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating activities:
Net loss	$ (35,397)	$ (21,840)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for losses on accounts receivable	1	0
Lower of cost or market reserve adjustment to inventory	2,924	5,207
Depreciation and amortization	12,154	11,964
Amortization of debt issuance costs	444	457
Deferred income taxes, net	5,147	(5,770)
Loss on disposal of assets	9	10
Share-based compensation	6,540	5,961
Unrealized foreign exchange gain	(134)	(171)
Changes in operating assets and liabilities:
Accounts receivable, trade	(9,690)	2,128
Notes receivable	(49)	(137)
Prepaid income tax	13	(127)
Inventories	(15,362)	6,346
Other current assets	(725)	5,579
Operating right of use asset	300	561
Accounts payable	12,688	1,615
Accrued liabilities	(2,323)	(4,043)
Lease liability	(309)	(573)
Net cash provided by (used in) operating activities	(23,769)	7,167
Investing activities:
Purchase of property, plant and equipment	(6,759)	(26,286)
Proceeds from disposal of equipment	52	1
Deposits and prepaid for equipment	(2,304)	5,763
Purchase of intangible assets	(208)	(316)
Net cash used in investing activities	(9,219)	(20,838)
Financing activities:
Proceeds from issuance of notes payable and long-term debt, net of debt issuance costs	6,229	10,537
Principal payments of long-term debt and notes payable	(2,221)	(41,203)
Proceeds from line of credit borrowings	52,637	38,473
Repayments of line of credit borrowings	(48,689)	(42,211)
Proceeds from bank acceptance payable	14,080	4,471
Repayments of bank acceptance payable	(10,377)	(6,575)
Proceeds from issuance of convertible senior notes, net of debt issuance costs	(16)	76,364
Principal payments of financing lease	(8)	0
Exercise of stock options	3	7
Payments of tax withholding on behalf of employees related to share-based compensation	(466)	(526)
Proceeds from common stock offering, net	13,929	0
Net cash provided by financing activities	25,101	39,337
Effect of exchange rate changes on cash	(232)	317
Net increase (decrease) in cash, cash equivalents and restricted cash	(8,119)	25,983
Cash, cash equivalents and restricted cash at beginning of period	67,028	58,004
Cash, cash equivalents and restricted cash at end of period	58,909	83,987
Supplemental disclosure of cash flow information:
Interest, net of amounts capitalized	2,478	498
Income taxes	(192)	224
Non-cash investing and financing activities:
Purchase of property and equipment with line of credit borrowings	941	0
Net change in accounts payable related to property and equipment additions	(710)	777
Net change in deposits and prepaid for equipment related to property and equipment additions	$ 1,327	$ 0

Note 1 - Description of Busines

Note 1 - Description of Business	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Business Description and Basis of Presentation [Text Block]	Note 1. ​ Business Overview ​ Applied Optoelectronics, Inc. (“AOI” or the “Company”) is a Delaware corporation. The Company is a leading, vertically integrated provider of fiber-optic networking products, primarily for four ​ The Company has manufacturing and research and development facilities located in the U.S., Taiwan and China. In the U.S., at its corporate headquarters and manufacturing facilities in Sugar Land, Texas, the Company primarily manufactures lasers and laser components and performs research and development activities for laser component and optical module products. In addition, the Company also has a research and development facility in Duluth, Georgia. The Company operates in Taipei, Taiwan and Ningbo, China through its wholly-owned subsidiary Prime World International Holdings, Ltd. (“Prime World”, incorporated in the British Virgin Islands). Prime World operates a branch in Taipei, Taiwan, which primarily manufactures transceivers and performs research and development activities for the transceiver products. Prime World is also the parent of Global Technology, Inc. (“Global”, incorporated in the People’s Republic of China). Through Global, the Company primarily manufactures certain of its data center transceiver products, including subassemblies, as well as CATV systems and equipment, and performs research and development activities for the CATV products. ​ Interim Financial Statements ​ The unaudited condensed consolidated financial statements of the Company as of June 30, 2020 December 31, 2019 three six June 30, 2020 June 30, 2019 10 10 01 X 10 December 31, 2019 three six June 30, 2020 not ​ Use of Estimates ​ The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported. Actual results could differ from those estimates in the consolidated financial statements and accompanying notes. Significant estimates and assumptions that impact these financial statements and the accompanying notes relate to, among other things, allowance for credit losses, inventory reserve, product warranty costs, share-based compensation expense, estimated useful lives of property and equipment, and taxes. ​

Note 2 - Significant Accounting

Note 2 - Significant Accounting Policies	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Significant Accounting Policies [Text Block]	Note 2. ​ There have been no three six June 30, 2020 2019 ​ Recent Accounting Pronouncements ​ Recent Accounting Pronouncements Adopted in 2020 In June 2016, 2016 13 not January 1, 2020. not may In March 2020, 2020 03, seven 2020 03 not ​ Recent Accounting Pronouncements Yet to be Adopted ​ In December 2019, 2019 12, 740 . In March 2020, 2020 04, 848 March 12, 2020, may December 31, 2022.

Note 3 - Revenue Recognition

Note 3 - Revenue Recognition	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	Note 3. ​ ​ Disaggregation of Revenue ​ Revenue is classified based on the location of where the product is manufactured. For additional information on the disaggregated revenues by geographical region, see Note 17, ​ Revenue is also classified by major product category and is presented below (in thousands): ​ Three months ended June 30, ​ % of % of ​ 2020 Revenue 2019 Revenue Data Center $ 52,533 80.5 % $ 31,806 73.3 % CATV 6,141 9.4 % 9,818 22.6 % Telecom 6,170 9.5 % 1,630 3.8 % FTTH 1 0.0 % 16 0.0 % Other 377 0.6 % 141 0.3 % Total Revenue $ 65,222 100.0 % $ 43,411 100.0 % ​ Six months ended June 30, ​ % of % of ​ 2020 Revenue 2019 Revenue Data Center $ 85,797 81.2 % $ 70,305 73.1 % CATV 10,364 9.8 % 21,780 22.7 % Telecom 8,730 8.3 % 3,368 3.5 % FTTH 1 0.0 % 110 0.1 % Other 797 0.7 % 567 0.6 % Total Revenue $ 105,689 100.0 % $ 96,130 100.0 % ​ ​

Note 4 - Leases

Note 4 - Leases	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Lessee, Operating and Finance Leases [Text Block]	Note 4. ​ The Company leases space under non-cancellable operating leases for manufacturing facilities, research and development offices and certain storage facilities and apartments. These leases do not one one ​ As most of the Company’s leases do not ​ The Components of lease expense were as follows for the periods indicated (in thousands): ​ Three months ended June 30, ​ 2020 2019 Operating lease expense $ 296 $ 318 Financing lease expense 8 — Short Term lease expense 37 51 Total lease expense $ 341 $ 369 Maturities of lease liabilities are as follows for the future one June 30, ​ Operating Financing 2021 $ 1,268 $ 22 2022 1,227 22 2023 1,171 22 2024 1,113 55 2025 1,123 — 2026 and thereafter 4,572 — Total lease payments $ 10,474 $ 121 Less imputed interest (1,738 ) (13 ) Present value $ 8,736 $ 108 ​ The weighted average remaining lease term and discount rate for operating leases were as follows for the periods indicated: ​ Six months ended June 30, ​ 2020 2019 Weighted Average Remaining Lease Term (Years) - operating leases 8.65 9.69 Weighted Average Remaining Lease Term (Years) - financing leases 3.33 — Weighted Average Discount Rate - operating leases 3.16 % 3.13 % Weighted Average Discount Rate - financing leases 5.00 % — Supplemental cash flow information related to operating leases was as follows for the periods indicated (in thousands): Six months ended June 30, ​ 2020 2019 Cash paid for amounts included in the measurement of lease liabilities ​ ​ Operating cash flows from operating leases 640 676 Operating cash flows from financing lease 3 — Financing cash flows from financing lease 8 — Right-of-use assets obtained in exchange for new operating lease liabilities 261 15 ​

Note 5 - Cash, Cash Equivalents

Note 5 - Cash, Cash Equivalents and Restricted Cash	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Cash and Cash Equivalents Disclosure [Text Block]	Note 5. ​ The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the statement of financial position that sum to the total of the same such amounts in the statement of cash flows (in thousands): June 30, December 31, ​ 2020 2019 Cash and cash equivalents $ 51,131 $ 59,977 Restricted cash 7,778 7,051 Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 58,909 $ 67,028 ​ Restricted cash includes guarantee deposits for customs duties, research and development equipment additions, and compensating balances required for certain credit facilities. As of June 30, 2020 December 31, 2019, June 30, 2020 December 31, 2019 ​

Note 6 - Earnings Per Share

Note 6 - Earnings Per Share	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Earnings Per Share [Text Block]	Note 6. ​ Basic net loss per share has been computed using the weighted-average number of shares of common stock outstanding during the period. Diluted net loss per share has been computed using the weighted-average number of shares of common stock and dilutive potential common shares from stock options, restricted stock units and senior convertible notes outstanding during the period. In periods with net losses, normally dilutive shares become anti-dilutive. Therefore, basic and diluted loss per share are the same. ​ The following table sets forth the computation of the basic and diluted net loss per share for the periods indicated (in thousands): ​ Three months ended June 30, Six months ended June 30, ​ 2020 2019 2020 2019 Numerator: ​ ​ ​ ​ Net loss $ (18,600 ) $ (11,366 ) $ (35,397 ) $ (21,840 ) Denominator: ​ ​ ​ ​ Weighted average shares used to compute net loss per share ​ ​ ​ ​ Basic 20,858 19,932 20,533 19,898 Diluted 20,858 19,932 20,533 19,898 Net loss per share ​ ​ ​ ​ Basic $ (0.89 ) $ (0.57 ) $ (1.72 ) $ (1.10 ) Diluted $ (0.89 ) $ (0.57 ) $ (1.72 ) $ (1.10 ) ​ The following potentially dilutive securities were excluded from the diluted net loss per share as their effect would have been antidilutive (in thousands): ​ Three months ended June 30, Six months ended June 30, ​ 2020 2019 2020 2019 Employee stock options 11 29 13 63 Restricted stock units 10 — 13 2 Shares for convertible senior notes 4,587 4,587 4,587 4,587 Total antidilutive shares 4,608 4,616 4,613 4,652 ​ ​

Note 7 - Inventories

Note 7 - Inventories	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Inventory Disclosure [Text Block]	Note 7. ​ Inventories, net of inventory write-downs, consist of the following for the periods indicated (in thousands): ​ ​ June 30, 2020 December 31, 2019 Raw materials $ 33,808 $ 15,570 Work in process and sub-assemblies 53,049 50,787 Finished goods 10,394 18,671 Total inventories $ 97,251 $ 85,028 ​ The lower of cost or market adjustment expensed for inventory for the three June 30, 2020 2019 six June 30, 2020 2019 For the three June 30, 2020 2019 six June 30, 2020 2019

Note 8 - Property, Plant and Eq

Note 8 - Property, Plant and Equipment	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	Note 8. ​ Property, plant and equipment consisted of the following for the periods indicated (in thousands): ​ ​ June 30, 2020 December 31, 2019 Land improvements $ 806 $ 806 Building and improvements 84,375 83,846 Machinery and equipment 239,213 237,464 Furniture and fixtures 5,276 5,105 Computer equipment and software 11,123 10,506 Transportation equipment 657 658 ​ 341,450 338,385 Less accumulated depreciation and amortization (126,778 ) (116,979 ) ​ 214,672 221,406 Construction in progress 28,353 25,937 Land 1,101 1,101 Total property, plant and equipment, net $ 244,126 $ 248,444 ​ For the three June 30, 2020 2019 six June 30, 2020 2019 June 30, 2020 December 31, 2019, As of June 30, 2020 , the Company concluded that its continued loss history constitutes a triggering event as described in ASC 360 - 10 - 35 - 21, Property, Plant, and Equipment . The Company performed a recoverability test and concluded that future undiscounted cash flows exceed the carrying amount of the Company’s long-lived assets and therefore no ​ ​

Note 9 - Intangible Assets, Net

Note 9 - Intangible Assets, Net	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Intangible Assets Disclosure [Text Block]	Note 9. ​ Intangible assets consisted of the following for the periods indicated (in thousands): ​ June 30, 2020 ​ Gross Accumulated Intangible ​ Amount amortization assets, net Patents $ 7,850 $ (3,850 ) $ 4,000 Trademarks 20 (14 ) 6 Total intangible assets $ 7,870 $ (3,864 ) $ 4,006 ​ December 31, 2019 ​ Gross Accumulated Intangible ​ Amount amortization assets, net Patents $ 7,638 $ (3,560 ) $ 4,078 Trademarks 17 (14 ) 3 Total intangible assets $ 7,655 $ (3,574 ) $ 4,081 ​ For the three June 30, 2020 2019 six June 30, 2020 2019 At June 30, 2020 2021 $ 561 2022 561 2023 561 2024 561 2025 561 thereafter 1,201 $ 4,006

Note 10 - Fair Value of Financi

Note 10 - Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Fair Value Disclosures [Text Block]	Note 10. ​ The following table represents a summary of the Company’s financial instruments measured at fair value on a recurring basis for the periods indicated (in thousands): ​ As of June 30, 2020 As of December 31, 2019 ​ (Level 1) (Level 2) (Level 3) Total (Level 1) (Level 2) (Level 3) Total Assets: ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents $ 51,131 $ — $ — $ 51,131 $ 59,977 $ — $ — $ 59,977 Restricted cash 7,778 — — 7,778 7,051 — — 7,051 Total assets $ 58,909 $ — $ — $ 58,909 $ 67,028 $ — $ — $ 67,028 Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ Bank acceptance payable — $ 9,866 — $ 9,866 — $ 6,310 — 6,310 Convertible senior notes — 68,591 — 68,591 — 77,191 — 77,191 Total liabilities $ — $ 78,457 $ — $ 78,457 $ — $ 83,501 $ — $ 83,501 ​ The carrying value amounts of accounts receivable, prepaid expenses and other current assets, accounts payable, accrued expenses and other current liabilities approximate fair value because of the short-term maturity of these instruments. The carrying value amounts of bank acceptances approximate fair value due to the short-term nature of the debt since it renews frequently at current interest rates. The Company believes that the interest rates in effect at each period end represent the current market rates for similar borrowings. The fair value of its convertible senior debt is measured for disclosure purpose. The fair value is based on observable market prices for this debt, which is traded in less active markets and are therefore classified as a Level 2

Note 11 - Notes Payable and Lon

Note 11 - Notes Payable and Long-term Debt	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Debt Disclosure [Text Block]	Note 11. ​ Notes payable and long-term debt consisted of the following for the periods indicated (in thousands): ​ June 30, 2020 December 31, 2019 Revolving line of credit with a U.S. bank up to $20,000 1.5% April 2, 2021 $ 18,741 $ 20,000 Paycheck Protection Program Term Note with interest at fixed rate 1.0% April 16, 2022 6,229 — Revolving line of credit with a Taiwan bank up to $3,336 2.2% July 31, 2020 3,375 3,336 Notes payable to a finance company due in monthly installments with 3.4% November 30, 2021 3,187 4,262 Notes payable to a finance company due in monthly installments with 3.1% January 21, 2022 3,562 4,633 Revolving line of credit with a Taiwan bank up to $2,668 1.7% April 11, 2020 — 2,668 Revolving line of credit with a China bank up to $8,917 4.5% October 14, 2020 977 — Revolving line of credit with a China bank up to $25,449 3.01% 4.57% May 24, 2024 9,698 7,919 Credit facility with a China bank up to $14,125 3.5% November 7, 2020 4,999 — Credit facility with a China bank up to $7,167 5.7% June 20, 2022 7,063 7,167 Sub-total 57,831 49,985 Less debt issuance costs, net (55 ) (62 ) Grand total 57,776 49,923 Less current portion (42,234 ) (33,371 ) Non-current portion $ 15,542 $ 16,552 ​ ​ ​ Bank Acceptance Notes Payable ​ ​ Bank acceptance notes issued to vendors with a zero percent interest rate $ 9,866 $ 6,310 The current portion of long-term debt is the amount payable within one June 30, 2020 ​ Maturities of long-term debt are as follows for the future one June 30, ​ 2021 $ 42,234 2022 15,542 Total outstanding $ 57,776 ​ On September 28, 2017, December 2019). three not one ​ On March 30, 2018, $60 $26 $21.5 three $50 September 28, 2017. 1 three $50 2 five 3 seventy one one one not ​ On February 1, 2019, September 28, 2017, first March 30, 2018, three five seventy March 30, 2019 June 30, 2020 ​ On March 5, 2019, 12 $60,000,000 $25,000,000; not not not seven seven ​ On March 5, 2019, ​ On September 30, 2019, $25,000,000 $20,000,000; September 28, 2020 April 2, 2021; ( 1.0, twelve seventy-five ​ As of June 30, 2020 June 30, 2020 On April 17, 2020, 1.00%, first six November 2020, 18 April 2022. may may may eight not ​ ​ On November 29, 2018, NT$267,340,468, three NT$67,340,468, NT$5,571,229, NT$6,139,188, NT$210,601,605, June 30, 2020 ​ On January 21, 2019, NT$267,333,186, three NT$67,333,186, NT$5,570,167, NT$6,082,131, NT$209,555,736 June 30, 2020 ​ On April 11, 2019, one NT$80 may April 11, 2019 April 11, 2020. one 0.655%; TAIFX3 one TAIFX3 June 30, 2020 On July 23, 2019, one NT$100 “NT$100M “US$1M NT$100M US$1M NT$100M US$1M may July 23, 2019 July 31, 2020. NT$100M 90 120 US$1M June 30, 2020 ​ On April 19, 2019, twelve April 14, 2020, six may April 19, 2019 October 14, 2020 ( may may June 30, 2020 ​ On April 30, 2019, one ¥9.9M ¥9.9M may ¥9.9M April 30, 2019 May 9, 2019. ¥9.9M April 30, 2020 twelve 12 ¥9.9M ¥9.9M ¥9.9M May 24, 2019. ​ On May 7, 2019, one ¥30M ¥30M ¥30M May 7, 2020 twelve 12 ¥30M twelve 12 ¥30M ¥30M ¥30M May 24, 2019. On May 8, 2019, six “$2M $2M $2M November 7, 2019 six 6 $2M 6 $2M $2M $2M May 24, 2019. On May 24, 2019, five 180 30 May 7, 2019; 9.9 April 30, 2019 May 8, 2019. may 5 may June 30, 2020 ​ On June 21, 2019, “¥100M ¥100M may ¥100M June 21, 2019 January 4, 2021 ( “¥100M ¥100M may ¥100M ¥100M may ¥100M ¥100M June 30, 2020 ¥100M ​ On June 21, 2019, three “¥50M ¥50M may ¥50M June 21, 2019 June 20, 2022 ( “¥50M ¥50M may ¥50M ¥50M may ¥50M June 30, 2020 ¥50M ​ As of June 30, 2020 December 31, 2019 ​ One-month LIBOR rates were 0.2% and 1.8% at June 30, 2020 December 31, 2019 ​ As of June 30, 2020 December 31, 2019 ​

Note 12 - Convertible Senior No

Note 12 - Convertible Senior Notes	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Convertible Debt [Text Block]	Note 12. ​ On March 5, 2019, 2024 March 5, 2019 5.00% March 15 September 15 September 15, 2019. March 15, 2024, ​ The sale of the Notes generated net proceeds of $76.4 million, after deducting the Initial Purchasers’ discounts and offering expenses payable by the Company. The Company used approximately $37.8 million of the net proceeds from the offering to fully repay the CapEx Loan and Term Loan with Truist Bank and the remainder will be used for general corporate purposes. ​ The following table presents the carrying value of the Notes for the periods indicated (in thousands): ​ June 30, December 31, ​ 2020 2019 Principal $ 80,500 $ 80,500 Unamortized debt issuance costs (3,061 ) (3,459 ) Net carrying amount $ 77,439 $ 77,041 ​ The Notes are convertible at the option of holders of the Notes at any time until the close of business on the scheduled trading day immediately preceding the maturity date. Upon conversion, holders of the Notes will receive shares of the Company’s common stock, together, if applicable, with cash in lieu of any fractional share, at the then-applicable conversion rate. The initial conversion rate is 56.9801 shares of the Company’s common stock per $1,000 principal amount of Notes (representing an initial conversion price of approximately $17.55 per share of common stock, which represents an initial conversion premium of approximately 30% above the closing price of $13.50 per share of the Company’s common stock on February 28, 2019 March 15, 2022, Initially there are no Holders may The Company may not March 15, 2022. March 15, 2022, may not The Indenture contains covenants that limit the Company’s ability and the ability of our subsidiaries to, among other things: (i) incur or guarantee additional indebtedness or issue disqualified stock; and (ii) create or incur liens. ​ Pursuant to the guidance in ASC 815 40, Contracts in Entity’s Own Equity 815 40, 1 2 815 40 25 7 815 40 25 10. not 470 20, Debt with Conversion and Other Options The Company incurred approximately $4.1 million in transaction costs in connection with the issuance of the Notes. These costs were recognized as a reduction of the carrying amount of the Notes utilizing the effective interest method and are being amortized over the term of the notes. ​ The following table sets forth interest expense information related to the Notes (in thousands): ​ Three months ended June 30, Six months ended June 30, ​ 2020 2019 2020 2019 Contractual interest expense $ 1,006 $ 1,006 $ 2,013 $ 1,308 Amortization of debt issuance costs 205 205 414 266 Total interest cost $ 1,211 $ 1,211 $ 2,427 $ 1,574 Effective interest rate 5.1 % 5.1 % 5.1 % 5.1 %

Note 13 - Accrued Liabilities

Note 13 - Accrued Liabilities	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block]	Note 13. ​ Accrued liabilities consisted of the following for the periods indicated (in thousands): ​ June 30, 2020 December 31, 2019 Accrued payroll $ 7,737 $ 11,009 Accrued employee benefits 2,484 2,288 Accrued state and local taxes 688 1,215 Accrued interest 1215 1208 Advance payments 455 312 Accrued product warranty 785 821 Accrued commission expenses 972 420 Accrued professional fees 232 222 Accrued utility expenses 351 155 Accrued other 638 214 Total accrued liabilities $ 15,557 $ 17,864 ​ ​

Note 14 - Other Income and Expe

Note 14 - Other Income and Expense	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Other Nonoperating Income and Expense [Text Block]	Note 14. ​ Other income and (expense) consisted of the following for the periods indicated (in thousands): ​ Three months ended June 30, Six months ended June 30, ​ 2020 2019 2020 2019 Foreign exchange transaction gain (loss) $ 113 $ 216 $ 252 $ (17 ) Government subsidy income 876 74 981 162 Other non-operating gain (loss) (6 ) 161 6 161 Loss on disposal of assets (9 ) — (9 ) (10 ) Total other income, net $ 974 $ 451 $ 1,230 $ 296 ​ ​

Note 15 - Share-based Compensat

Note 15 - Share-based Compensation	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Share-based Payment Arrangement [Text Block]	Note 15. ​ Equity Plans ​ The Company’s board of directors and stockholders approved the following equity plans: ​ ● the 2006 ● the 2013 “2013 ​ The Company issued stock options, restricted stock awards (“RSAs”) and restricted stock units (“RSUs”) to employees, consultants and non-employee directors. Stock option awards generally vest over a four ten may September 2013, third ​ Stock Options ​ Options have been granted to the Company’s employees under the two first ten ​ The following is a summary of option activity (in thousands, except per share data): ​ ​ ​ Weighted ​ Weighted ​ ​ ​ Weighted Average ​ Average ​ ​ ​ Average Share Price Weighted Remaining Aggregate ​ Number of Exercise on Date of Average Contractual Intrinsic ​ shares Price Exercise Fair Value Life Value ​ (in thousands, except price data) Outstanding at January 1, 2020 281 $ 10.20 ​ $ 5.32 ​ $ 573 Exercised (1 ) — — ​ — Outstanding, June 30, 2020 280 $ 10.22 ​ $ 5.32 3.13 341 Exercisable, June 30, 2020 280 $ 10.22 ​ ​ 3.62 341 Vested and expected to vest 280 $ 10.22 ​ ​ 3.13 341 ​ As of June 30, 2020 ​ Restricted Stock Units/Awards ​ The following is a summary of RSU/RSA activity (in thousands, except per share data): ​ ​ Weighted ​ ​ ​ ​ Average Share Weighted Aggregate ​ Number of Price on Date Average Fair Intrinsic ​ shares of Release Value Value ​ (in thousands, except price data) Outstanding at January 1, 2020 770 ​ $ 25.18 $ 9,143 Granted 1,181 ​ 11.41 13,482 Released (275 ) $ 10.55 22.04 2,901 Cancelled/Forfeited (18 ) ​ 17.1 191 Outstanding, June 30, 2020 1,658 ​ 15.98 18,023 Vested and expected to vest 1,658 ​ 15.98 18,023 ​ As of June 30, 2020 ​ Share-Based Compensation ​ Employee share-based compensation expenses recognized for the periods indicated (in thousands): ​ Three months ended Six months ended ​ June 30, June 30, ​ 2020 2019 2020 2019 Share-based compensation - by expense type ​ ​ Cost of goods sold $ 237 $ 198 $ 483 $ 387 Research and development 704 657 1,392 1,296 Sales and marketing 295 279 586 550 General and administrative 2,066 1,885 4,079 3,728 Total share-based compensation expense $ 3,302 $ 3,019 $ 6,540 $ 5,961

Note 16 - Income Taxes

Note 16 - Income Taxes	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Income Tax Disclosure [Text Block]	Note 16. ​ The Company’s tax provision or benefit from income taxes for interim periods is determined using an estimate of its annual effective tax rate, adjusted for discrete items, if any, that are taken into account in the relevant period. The Company’s quarterly tax provision, and its quarterly estimate of its annual effective tax rate, are subject to significant variation due to several factors, including variability in accurately predicting its pre-tax income and loss and the mix of jurisdictions to which they relate, tax law developments and relative changes in permanent tax benefits or expenses. ​ The Company’s effective tax rate for the three June 30, 2020 2019 three June 30, 2020, three June 30, 2019 The Company’s effective tax rate for the six June 30, 2020 2019 six June 30, 2020, six June 30, 2019 Management assesses the available positive and negative evidence to estimate whether sufficient future taxable income will be generated to permit use of the existing DTAs. A significant piece of objective negative evidence evaluated was the cumulative losses incurred over the three June 30, 2020 On the basis of this evaluation, as of June 30, 2020, not no In response to the global pandemic related to COVID- 19, March 27, 2020. 163 six June 30 , 2020, no 19

Note 17 - Geographic Informatio

Note 17 - Geographic Information	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	Note 17. ​ The Company operates in one reportable segment. The Company’s Chief Executive Officer, who is considered to be the chief operating decision maker, manages the Company’s operations as a whole and reviews financial information presented on a consolidated basis, accompanied by information about product revenue, for purposes of evaluating financial performance and allocating resources. ​ The following tables set forth the Company’s revenue and asset information by geographic region. Revenue is classified based on the location of where the product is manufactured. Long-lived assets in the tables below comprise only property, plant, equipment and intangible assets (in thousands): ​ Three months ended June 30, Six months ended June 30, ​ 2020 2019 2020 2019 Revenues: ​ ​ ​ ​ United States $ 4,735 $ 1,652 $ 8,496 $ 3,650 Taiwan 40,604 22,108 64,486 46,128 China 19,883 19,651 32,707 46,352 ​ $ 65,222 $ 43,411 $ 105,689 $ 96,130 ​ As of the period ended ​ June 30, December 31, ​ 2020 2019 Long-lived assets: ​ ​ United States $ 93,604 $ 94,507 Taiwan 72,420 73,816 China 95,219 97,687 ​ $ 261,243 $ 266,010 ​

Note 18 - Contingencies

Note 18 - Contingencies	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	Note 18. ​ Litigation ​ Overview From time to time, the Company may not Except for the lawsuits described below, the Company believes that there are no Class Action and Shareholder Derivative Litigation ​ On August 5, 2017, two Mona Abouzied v. Applied Optoelectronics, Inc., Chih-Hsiang (Thompson) Lin, and Stefan J. Murry, et al. No. 4:17 02399. 10 20 August 3, 2017 40G one 100G.” August 16, 2017 ( No. 4:17 02512 two January 22, 2018, March 6, 2018. April 4, 2018, March 28, 2019. May 15, 2019, X. May 16, 2019. second May 28, 2019, 23 July 12, 2019, August 26, 2019, November 13, 2019, November 27, 2019. December 11, 2019, December 16, 2019, December 20, 2019. January 3, 2020, January 13, 2020, January 21, 2020. January 23, 2020, 90 January 24, 2020. April 7, 2020, 40 June 2, 2020. On June 2, 2020, June 4, 2020, no August 3, 2020. On August 3, 2020, $15.5 not not not On August 7, 2018, Lei Jin, derivatively on behalf of Applied Optoelectronics, Inc. v. Chih-Hsiang (“Thompson”) Lin, Stefan J. Murry, William H. Yeh, Alex Ignatiev, Richard B. Black, Min-Chu Chen, Alan Moore, and Che-Wei Lin and Applied Optoelectronics, Inc. No. 4:18 02713 14 Abouzied December 18, 2018, second Yiu Kwong Ng v. Chih-Hsiang (“Thompson”) Lin, Stefan J. Murry, William H. Yeh, Alex Ignatiev, Richard B. Black, Min-Chu Chen, Alan Moore, and Che-Wei Lin and Applied Optoelectronics, Inc. No. 4:18 4751 Jin September 28, 2018 25G January 11, 2019, two January 15, 2019, June 24, 2020, July 2, 2020, August 3, 2020. July 31, 2020, September 2, 2020. not

Note 19 - Subsequent Events

Note 19 - Subsequent Events	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Subsequent Events [Text Block]	Note 19. ​ As of reporting date ,

Significant Accounting Policies

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements ​ Recent Accounting Pronouncements Adopted in 2020 In June 2016, 2016 13 not January 1, 2020. not may In March 2020, 2020 03, seven 2020 03 not ​ Recent Accounting Pronouncements Yet to be Adopted ​ In December 2019, 2019 12, 740 . In March 2020, 2020 04, 848 March 12, 2020, may December 31, 2022.

Note 3 - Revenue Recognition (T

Note 3 - Revenue Recognition (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Disaggregation of Revenue [Table Text Block]	Three months ended June 30, ​ % of % of ​ 2020 Revenue 2019 Revenue Data Center $ 52,533 80.5 % $ 31,806 73.3 % CATV 6,141 9.4 % 9,818 22.6 % Telecom 6,170 9.5 % 1,630 3.8 % FTTH 1 0.0 % 16 0.0 % Other 377 0.6 % 141 0.3 % Total Revenue $ 65,222 100.0 % $ 43,411 100.0 % Six months ended June 30, ​ % of % of ​ 2020 Revenue 2019 Revenue Data Center $ 85,797 81.2 % $ 70,305 73.1 % CATV 10,364 9.8 % 21,780 22.7 % Telecom 8,730 8.3 % 3,368 3.5 % FTTH 1 0.0 % 110 0.1 % Other 797 0.7 % 567 0.6 % Total Revenue $ 105,689 100.0 % $ 96,130 100.0 %

Note 4 - Leases (Tables)

Note 4 - Leases (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Lease, Cost [Table Text Block]	Three months ended June 30, ​ 2020 2019 Operating lease expense $ 296 $ 318 Financing lease expense 8 — Short Term lease expense 37 51 Total lease expense $ 341 $ 369 Six months ended June 30, ​ 2020 2019 Weighted Average Remaining Lease Term (Years) - operating leases 8.65 9.69 Weighted Average Remaining Lease Term (Years) - financing leases 3.33 — Weighted Average Discount Rate - operating leases 3.16 % 3.13 % Weighted Average Discount Rate - financing leases 5.00 % — Six months ended June 30, ​ 2020 2019 Cash paid for amounts included in the measurement of lease liabilities ​ ​ Operating cash flows from operating leases 640 676 Operating cash flows from financing lease 3 — Financing cash flows from financing lease 8 — Right-of-use assets obtained in exchange for new operating lease liabilities 261 15
Lessee, Operating and Finance Lease, Liability, Maturity [Table Text Block]	Operating Financing 2021 $ 1,268 $ 22 2022 1,227 22 2023 1,171 22 2024 1,113 55 2025 1,123 — 2026 and thereafter 4,572 — Total lease payments $ 10,474 $ 121 Less imputed interest (1,738 ) (13 ) Present value $ 8,736 $ 108

Note 5 - Cash, Cash Equivalen_2

Note 5 - Cash, Cash Equivalents and Restricted Cash (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Cash and Cash Equivalents [Table Text Block]	June 30, December 31, ​ 2020 2019 Cash and cash equivalents $ 51,131 $ 59,977 Restricted cash 7,778 7,051 Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 58,909 $ 67,028

Note 6 - Earnings Per Share (Ta

Note 6 - Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three months ended June 30, Six months ended June 30, ​ 2020 2019 2020 2019 Numerator: ​ ​ ​ ​ Net loss $ (18,600 ) $ (11,366 ) $ (35,397 ) $ (21,840 ) Denominator: ​ ​ ​ ​ Weighted average shares used to compute net loss per share ​ ​ ​ ​ Basic 20,858 19,932 20,533 19,898 Diluted 20,858 19,932 20,533 19,898 Net loss per share ​ ​ ​ ​ Basic $ (0.89 ) $ (0.57 ) $ (1.72 ) $ (1.10 ) Diluted $ (0.89 ) $ (0.57 ) $ (1.72 ) $ (1.10 )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	Three months ended June 30, Six months ended June 30, ​ 2020 2019 2020 2019 Employee stock options 11 29 13 63 Restricted stock units 10 — 13 2 Shares for convertible senior notes 4,587 4,587 4,587 4,587 Total antidilutive shares 4,608 4,616 4,613 4,652

Note 7 - Inventories (Tables)

Note 7 - Inventories (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Inventory, Current [Table Text Block]	​ June 30, 2020 December 31, 2019 Raw materials $ 33,808 $ 15,570 Work in process and sub-assemblies 53,049 50,787 Finished goods 10,394 18,671 Total inventories $ 97,251 $ 85,028

Note 8 - Property, Plant and _2

Note 8 - Property, Plant and Equipment (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Property, Plant and Equipment [Table Text Block]	​ June 30, 2020 December 31, 2019 Land improvements $ 806 $ 806 Building and improvements 84,375 83,846 Machinery and equipment 239,213 237,464 Furniture and fixtures 5,276 5,105 Computer equipment and software 11,123 10,506 Transportation equipment 657 658 ​ 341,450 338,385 Less accumulated depreciation and amortization (126,778 ) (116,979 ) ​ 214,672 221,406 Construction in progress 28,353 25,937 Land 1,101 1,101 Total property, plant and equipment, net $ 244,126 $ 248,444

Note 9 - Intangible Assets, N_2

Note 9 - Intangible Assets, Net (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Finite-Lived Intangible Assets [Table Text Block]	June 30, 2020 ​ Gross Accumulated Intangible ​ Amount amortization assets, net Patents $ 7,850 $ (3,850 ) $ 4,000 Trademarks 20 (14 ) 6 Total intangible assets $ 7,870 $ (3,864 ) $ 4,006 December 31, 2019 ​ Gross Accumulated Intangible ​ Amount amortization assets, net Patents $ 7,638 $ (3,560 ) $ 4,078 Trademarks 17 (14 ) 3 Total intangible assets $ 7,655 $ (3,574 ) $ 4,081
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	2021 $ 561 2022 561 2023 561 2024 561 2025 561 thereafter 1,201 $ 4,006

Note 10 - Fair Value of Finan_2

Note 10 - Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	As of June 30, 2020 As of December 31, 2019 ​ (Level 1) (Level 2) (Level 3) Total (Level 1) (Level 2) (Level 3) Total Assets: ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents $ 51,131 $ — $ — $ 51,131 $ 59,977 $ — $ — $ 59,977 Restricted cash 7,778 — — 7,778 7,051 — — 7,051 Total assets $ 58,909 $ — $ — $ 58,909 $ 67,028 $ — $ — $ 67,028 Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ Bank acceptance payable — $ 9,866 — $ 9,866 — $ 6,310 — 6,310 Convertible senior notes — 68,591 — 68,591 — 77,191 — 77,191 Total liabilities $ — $ 78,457 $ — $ 78,457 $ — $ 83,501 $ — $ 83,501

Note 11 - Notes Payable and L_2

Note 11 - Notes Payable and Long-term Debt (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Debt [Table Text Block]	June 30, 2020 December 31, 2019 Revolving line of credit with a U.S. bank up to $20,000 1.5% April 2, 2021 $ 18,741 $ 20,000 Paycheck Protection Program Term Note with interest at fixed rate 1.0% April 16, 2022 6,229 — Revolving line of credit with a Taiwan bank up to $3,336 2.2% July 31, 2020 3,375 3,336 Notes payable to a finance company due in monthly installments with 3.4% November 30, 2021 3,187 4,262 Notes payable to a finance company due in monthly installments with 3.1% January 21, 2022 3,562 4,633 Revolving line of credit with a Taiwan bank up to $2,668 1.7% April 11, 2020 — 2,668 Revolving line of credit with a China bank up to $8,917 4.5% October 14, 2020 977 — Revolving line of credit with a China bank up to $25,449 3.01% 4.57% May 24, 2024 9,698 7,919 Credit facility with a China bank up to $14,125 3.5% November 7, 2020 4,999 — Credit facility with a China bank up to $7,167 5.7% June 20, 2022 7,063 7,167 Sub-total 57,831 49,985 Less debt issuance costs, net (55 ) (62 ) Grand total 57,776 49,923 Less current portion (42,234 ) (33,371 ) Non-current portion $ 15,542 $ 16,552 ​ ​ ​ Bank Acceptance Notes Payable ​ ​ Bank acceptance notes issued to vendors with a zero percent interest rate $ 9,866 $ 6,310
Schedule of Maturities of Long-term Debt [Table Text Block]	2021 $ 42,234 2022 15,542 Total outstanding $ 57,776

Note 12 - Convertible Senior _2

Note 12 - Convertible Senior Notes (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Convertible Debt [Table Text Block]	June 30, December 31, ​ 2020 2019 Principal $ 80,500 $ 80,500 Unamortized debt issuance costs (3,061 ) (3,459 ) Net carrying amount $ 77,439 $ 77,041
Interest Income and Interest Expense Disclosure [Table Text Block]	Three months ended June 30, Six months ended June 30, ​ 2020 2019 2020 2019 Contractual interest expense $ 1,006 $ 1,006 $ 2,013 $ 1,308 Amortization of debt issuance costs 205 205 414 266 Total interest cost $ 1,211 $ 1,211 $ 2,427 $ 1,574 Effective interest rate 5.1 % 5.1 % 5.1 % 5.1 %

Note 13 - Accrued Liabilities (

Note 13 - Accrued Liabilities (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Accrued Liabilities [Table Text Block]	June 30, 2020 December 31, 2019 Accrued payroll $ 7,737 $ 11,009 Accrued employee benefits 2,484 2,288 Accrued state and local taxes 688 1,215 Accrued interest 1215 1208 Advance payments 455 312 Accrued product warranty 785 821 Accrued commission expenses 972 420 Accrued professional fees 232 222 Accrued utility expenses 351 155 Accrued other 638 214 Total accrued liabilities $ 15,557 $ 17,864

Note 14 - Other Income and Ex_2

Note 14 - Other Income and Expense (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Other Nonoperating Income (Expense) [Table Text Block]	Three months ended June 30, Six months ended June 30, ​ 2020 2019 2020 2019 Foreign exchange transaction gain (loss) $ 113 $ 216 $ 252 $ (17 ) Government subsidy income 876 74 981 162 Other non-operating gain (loss) (6 ) 161 6 161 Loss on disposal of assets (9 ) — (9 ) (10 ) Total other income, net $ 974 $ 451 $ 1,230 $ 296

Note 15 - Share-based Compens_2

Note 15 - Share-based Compensation (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Share-based Payment Arrangement, Option, Activity [Table Text Block]	​ ​ Weighted ​ Weighted ​ ​ ​ Weighted Average ​ Average ​ ​ ​ Average Share Price Weighted Remaining Aggregate ​ Number of Exercise on Date of Average Contractual Intrinsic ​ shares Price Exercise Fair Value Life Value ​ (in thousands, except price data) Outstanding at January 1, 2020 281 $ 10.20 ​ $ 5.32 ​ $ 573 Exercised (1 ) — — ​ — Outstanding, June 30, 2020 280 $ 10.22 ​ $ 5.32 3.13 341 Exercisable, June 30, 2020 280 $ 10.22 ​ ​ 3.62 341 Vested and expected to vest 280 $ 10.22 ​ ​ 3.13 341
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]	​ Weighted ​ ​ ​ ​ Average Share Weighted Aggregate ​ Number of Price on Date Average Fair Intrinsic ​ shares of Release Value Value ​ (in thousands, except price data) Outstanding at January 1, 2020 770 ​ $ 25.18 $ 9,143 Granted 1,181 ​ 11.41 13,482 Released (275 ) $ 10.55 22.04 2,901 Cancelled/Forfeited (18 ) ​ 17.1 191 Outstanding, June 30, 2020 1,658 ​ 15.98 18,023 Vested and expected to vest 1,658 ​ 15.98 18,023
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]	Three months ended Six months ended ​ June 30, June 30, ​ 2020 2019 2020 2019 Share-based compensation - by expense type ​ ​ Cost of goods sold $ 237 $ 198 $ 483 $ 387 Research and development 704 657 1,392 1,296 Sales and marketing 295 279 586 550 General and administrative 2,066 1,885 4,079 3,728 Total share-based compensation expense $ 3,302 $ 3,019 $ 6,540 $ 5,961

Note 17 - Geographic Informat_2

Note 17 - Geographic Information (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Revenue from External Customers by Geographic Areas [Table Text Block]	Three months ended June 30, Six months ended June 30, ​ 2020 2019 2020 2019 Revenues: ​ ​ ​ ​ United States $ 4,735 $ 1,652 $ 8,496 $ 3,650 Taiwan 40,604 22,108 64,486 46,128 China 19,883 19,651 32,707 46,352 ​ $ 65,222 $ 43,411 $ 105,689 $ 96,130
Long-lived Assets by Geographic Areas [Table Text Block]	As of the period ended ​ June 30, December 31, ​ 2020 2019 Long-lived assets: ​ ​ United States $ 93,604 $ 94,507 Taiwan 72,420 73,816 China 95,219 97,687 ​ $ 261,243 $ 266,010

Note 3 - Revenue Recognition -

Note 3 - Revenue Recognition - Revenue by Major Product Category (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Total Revenue	$ 65,222	$ 43,411	$ 105,689	$ 96,130
Percent of Revenue	100.00%	100.00%	100.00%	100.00%
Data Center [Member]
Total Revenue	$ 52,533	$ 31,806	$ 85,797	$ 70,305
Percent of Revenue	80.50%	73.30%	81.20%	73.10%
CATV [Member]
Total Revenue	$ 6,141	$ 9,818	$ 10,364	$ 21,780
Percent of Revenue	9.40%	22.60%	9.80%	22.70%
Telecom [Member]
Total Revenue	$ 6,170	$ 1,630	$ 8,730	$ 3,368
Percent of Revenue	9.50%	3.80%	8.30%	3.50%
FTTH [Member]
Total Revenue	$ 1	$ 16	$ 1	$ 110
Percent of Revenue	0.00%	0.00%	0.00%	0.10%
Product and Service, Other [Member]
Total Revenue	$ 377	$ 141	$ 797	$ 567
Percent of Revenue	0.60%	0.30%	0.70%	0.60%

Note 4 - Leases - Components of

Note 4 - Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating lease expense	$ 296	$ 318
Financing lease expense	8	0
Short Term lease expense	37	51
Total lease expense	$ 341	$ 369
Weighted Average Remaining Lease Term (Years) - operating leases (Year)	8 years 7 months 24 days	9 years 8 months 8 days	8 years 7 months 24 days	9 years 8 months 8 days
Weighted Average Remaining Lease Term (Years) - financing leases (Year)	3 years 3 months 29 days		3 years 3 months 29 days
Weighted Average Discount Rate - operating leases	3.16%	3.13%	3.16%	3.13%
Weighted Average Discount Rate - financing leases	5.00%		5.00%
Operating cash flows from operating leases			$ 640	$ 676
Operating cash flows from financing lease			3	0
Financing cash flows from financing lease			8	0
Right-of-use assets obtained in exchange for new operating lease liabilities			$ 261	$ 15

Note 4 - Leases - Maturities of

Note 4 - Leases - Maturities of Lease Liabilities (Details) $ in Thousands	Jun. 30, 2020USD ($)
2021, operating leases	$ 1,268
2021, financing leases	22
2022, operating leases	1,227
2022, financing leases	22
2023, operating leases	1,171
2023, financing leases	22
2024, operating leases	1,113
2024, financing leases	55
2025, operating leases	1,123
2025, financing leases	0
2025 and thereafter, operating leases	4,572
2025 and thereafter, financing leases	0
Total operating lease payments	10,474
Total financing lease payments	121
Less imputed interest, operating leases	(1,738)
Less imputed interest, financing leases	(13)
Present value, operating leases	8,736
Present value, financing leases	$ 108

Note 5 - Cash, Cash Equivalen_3

Note 5 - Cash, Cash Equivalents and Restricted Cash (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Restricted Cash and Cash Equivalents, Current, Total	$ 7,778	$ 7,051
CHINA
Certificates of Deposit, at Carrying Value	1,900	4,200
Bankers Acceptance [Member]
Restricted Cash and Cash Equivalents, Current, Total	$ 3,200	$ 1,900

Note 5 - Cash, Cash Equivalen_4

Note 5 - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Cash and cash equivalents	$ 51,131	$ 59,977
Restricted cash	7,778	7,051
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 58,909	$ 67,028	$ 83,987	$ 58,004

Note 6 - Earnings Per Share - C

Note 6 - Earnings Per Share - Computation of Basic and Diluted Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net loss	$ (18,600)	$ (11,366)	$ (35,397)	$ (21,840)
Basic (in shares)	20,858,450	19,931,745	20,533,417	19,897,602
Diluted (in shares)	20,858,450	19,931,745	20,533,417	19,897,602
Basic (in dollars per share)	$ (0.89)	$ (0.57)	$ (1.72)	$ (1.10)
Diluted (in dollars per share)	$ (0.89)	$ (0.57)	$ (1.72)	$ (1.10)

Note 6 - Earnings Per Share - P

Note 6 - Earnings Per Share - Potentially Dilutive Securities Excluded from Diluted Net Income (Loss) per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Total antidilutive shares (in shares)	4,608	4,616	4,613	4,652
Share-based Payment Arrangement, Option [Member]
Total antidilutive shares (in shares)	11	29	13	63
Restricted Stock Units (RSUs) [Member]
Total antidilutive shares (in shares)	10	0	13	2
Convertible Debt Securities [Member]
Total antidilutive shares (in shares)	4,587	4,587	4,587	4,587

Note 7 - Inventories (Details T

Note 7 - Inventories (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Inventory, LIFO Reserve, Period Charge	$ 1,300	$ 2,900	$ 2,924	$ 5,207
Inventory Write-down	$ 3,700	$ 2,400	$ 6,200	$ 5,200

Note 7 - Inventories - Inventor

Note 7 - Inventories - Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Raw materials	$ 33,808	$ 15,570
Work in process and sub-assemblies	53,049	50,787
Finished goods	10,394	18,671
Total inventories	$ 97,251	$ 85,028

Note 8 - Property, Plant and _3

Note 8 - Property, Plant and Equipment (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Depreciation, Total	$ 6	$ 5.9	$ 11.9	$ 11.7
Interest Paid, Capitalized, Investing Activities			$ 0.4		$ 0.2

Note 8 - Property, Plant and _4

Note 8 - Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property, plant and equipment, gross	$ 341,450	$ 338,385
Less accumulated depreciation and amortization	(126,778)	(116,979)
Property, plant and equipment, net before construction in progress and land	214,672	221,406
Property, plant and equipment, net	244,126	248,444
Land Improvements [Member]
Property, plant and equipment, gross	806	806
Building and Building Improvements [Member]
Property, plant and equipment, gross	84,375	83,846
Machinery and Equipment [Member]
Property, plant and equipment, gross	239,213	237,464
Furniture and Fixtures [Member]
Property, plant and equipment, gross	5,276	5,105
Computer Equipment and Software [Member]
Property, plant and equipment, gross	11,123	10,506
Vehicles [Member]
Property, plant and equipment, gross	657	658
Construction in Progress [Member]
Property, plant and equipment, net	28,353	25,937
Land [Member]
Property, plant and equipment, net	$ 1,101	$ 1,101

Note 9 - Intangible Assets, N_3

Note 9 - Intangible Assets, Net (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Amortization of Intangible Assets, Total	$ 0.1	$ 0.1	$ 0.3	$ 0.3
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)			7 years

Note 9 - Intangible Assets, N_4

Note 9 - Intangible Assets, Net - Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Intangible assets, gross amount	$ 7,870	$ 7,655
Intangible assets, accumulated amortization	(3,864)	(3,574)
Intangible assets, net	4,006	4,081
Patents [Member]
Intangible assets, gross amount	7,850	7,638
Intangible assets, accumulated amortization	(3,850)	(3,560)
Intangible assets, net	4,000	4,078
Trademarks [Member]
Intangible assets, gross amount	20	17
Intangible assets, accumulated amortization	(14)	(14)
Intangible assets, net	$ 6	$ 3

Note 9 - Intangible Assets, N_5

Note 9 - Intangible Assets, Net - Future Amortization Expense (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
2021	$ 561
2022	561
2023	561
2024	561
2025	561
thereafter	1,201
Finite-Lived Intangible Assets, Net, Ending Balance	$ 4,006	$ 4,081

Note 10 - Fair Value of Finan_3

Note 10 - Fair Value of Financial Instruments - Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Cash and cash equivalents	$ 51,131	$ 59,977
Restricted cash	7,778	7,051
Total assets	58,909	67,028
Bank acceptance payable	9,866	6,310
Convertible senior notes	68,591	77,191
Total liabilities	78,457	83,501
Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	51,131	59,977
Restricted cash	7,778	7,051
Total assets	58,909	67,028
Bank acceptance payable	0	0
Convertible senior notes	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0
Restricted cash	0	0
Total assets	0	0
Bank acceptance payable	9,866	6,310
Convertible senior notes	68,591	77,191
Total liabilities	78,457	83,501
Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0
Restricted cash	0	0
Total assets	0	0
Bank acceptance payable	0	0
Convertible senior notes	0	0
Total liabilities	$ 0	$ 0

Note 11 - Notes Payable and L_3

Note 11 - Notes Payable and Long-term Debt (Details Textual)	Apr. 17, 2020USD ($)	Apr. 14, 2020	Sep. 30, 2019USD ($)	Jul. 23, 2019USD ($)	Jun. 21, 2019USD ($)	May 24, 2019USD ($)	May 08, 2019USD ($)	May 07, 2019USD ($)	Apr. 30, 2019USD ($)	Apr. 19, 2019USD ($)	Apr. 11, 2019USD ($)	Mar. 05, 2019USD ($)	Jan. 21, 2019USD ($)	Jan. 21, 2019TWD ($)	Dec. 11, 2018	Nov. 29, 2018USD ($)	Nov. 29, 2018TWD ($)	Mar. 30, 2018USD ($)	Sep. 28, 2017USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020	Dec. 31, 2019USD ($)	Jul. 23, 2019TWD ($)	Jun. 21, 2019CNY (¥)	May 24, 2019CNY (¥)	May 07, 2019CNY (¥)	Apr. 30, 2019CNY (¥)	Apr. 19, 2019CNY (¥)	Apr. 11, 2019TWD ($)	Jan. 21, 2019TWD ($)	Nov. 29, 2018TWD ($)
Long-term Debt, Gross																				$ 57,831,000		$ 49,985,000
Debt Instrument, Unused Borrowing Capacity, Amount																				$ 26,900,000		$ 34,700,000
LIBOR Rate																				0.20%		1.80%
Cash Collateral for Borrowed Securities																				$ 5,100,000		$ 6,100,000
Chailease Finance Co, Ltd. [Member] | Promissory Note [Member]
Long-term Debt, Gross																				$ 3,187,000		$ 4,262,000
Debt Instrument, Interest Rate, Stated Percentage																				3.40%		3.40%
Chailease Finance Co, Ltd. [Member] | Prime World International Holdings, Ltd. (“Prime World”) [Member] | Promissory Note [Member]
Debt Instrument, Face Amount																$ 6,800,000															$ 210,601,605
Long-term Debt, Gross																				$ 3,200,000
Chailease Finance Co, Ltd. [Member] | Finance Lease Agreement 2 [Member] | Prime World International Holdings, Ltd. (“Prime World”) [Member]
Sale Leaseback Transaction, Net Proceeds, Investing Activities, Total																$ 8,700,000	$ 267,340,468
Sale Leaseback Transaction, Term (Year)																3 years	3 years
Sale Leaseback Transaction, Initial Payment																$ 2,200,000	$ 67,340,468
Sale Leaseback Transaction, Imputed Interest Rate																3.50%	3.50%
Chailease Finance Co, Ltd. [Member] | Second Sales Contract [Member] | Prime World International Holdings, Ltd. (“Prime World”) [Member]
Sale Leaseback Transaction, Net Proceeds, Investing Activities, Total													$ 8,700,000	$ 267,333,186
Sale Leaseback Transaction, Term (Year)													3 years	3 years
Sale Leaseback Transaction, Initial Payment													$ 2,200,000	$ 67,333,186
Sale Leaseback Transaction, Imputed Interest Rate													3.10%	3.10%
Chailease Finance Co, Ltd. [Member] | Second Sales Contract [Member] | Prime World International Holdings, Ltd. (“Prime World”) [Member] | Promissory Note [Member]
Debt Instrument, Face Amount													$ 6,800,000																	$ 209,555,736
Long-term Debt, Gross																				3,600,000
Minimum [Member] | Chailease Finance Co, Ltd. [Member] | Finance Lease Agreement 2 [Member] | Prime World International Holdings, Ltd. (“Prime World”) [Member]
Sale Leaseback Transaction, Monthly Rental Payments																$ 200,000	$ 5,571,229
Minimum [Member] | Chailease Finance Co, Ltd. [Member] | Second Sales Contract [Member] | Prime World International Holdings, Ltd. (“Prime World”) [Member]
Sale Leaseback Transaction, Monthly Rental Payments													200,000	$ 5,570,167
Maximum [Member] | Chailease Finance Co, Ltd. [Member] | Finance Lease Agreement 2 [Member] | Prime World International Holdings, Ltd. (“Prime World”) [Member]
Sale Leaseback Transaction, Monthly Rental Payments																$ 200,000	$ 6,139,188
Maximum [Member] | Chailease Finance Co, Ltd. [Member] | Second Sales Contract [Member] | Prime World International Holdings, Ltd. (“Prime World”) [Member]
Sale Leaseback Transaction, Monthly Rental Payments													$ 200,000	$ 6,082,131
Paycheck Protection Program, CARES Act [Member]
Proceeds from Issuance of Long-term Debt, Total	$ 6,230,000
Long-term Debt, Gross																				$ 6,229,000		$ 0
Debt Instrument, Interest Rate, Stated Percentage																				1.00%		1.00%
Branch Banking and Trust Company [Member] | CapEx Loan [Member]
Debt Instrument, Term (Year)																		5 years
Debt Instrument, Face Amount																		$ 26,000,000
Branch Banking and Trust Company [Member] | Term Loan [Member]
Debt Instrument, Term (Year)																		70 months
Debt Instrument, Face Amount																		$ 21,500,000
Branch Banking and Trust Company [Member] | CapEx Loan and Term Loan [Member]
Repayments of Long-term Debt, Total												$ 37,800,000
Branch Banking and Trust Company [Member] | London Interbank Offered Rate (LIBOR) [Member] | CapEx Loan [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate																		1.30%
Branch Banking and Trust Company [Member] | London Interbank Offered Rate (LIBOR) [Member] | CapEx Loan [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate																		2.00%
Branch Banking and Trust Company [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate																		1.15%
Branch Banking and Trust Company [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate																		2.00%
Far Eastern [Member] | Far Eastern's Published One-Year Fixed Term Time Deposits Rate [Member] | Far Eastern Credit Facility [Member]
Debt Instrument, Basis Spread on Variable Rate											0.655%
Debt Instrument, Interest Rate, Effective Percentage																					1.045%
Far Eastern [Member] | TAIFX3 Rate [Member] | Far Eastern Credit Facility [Member]
Debt Instrument, Basis Spread on Variable Rate											0.70%
Debt Instrument, Interest Rate, Effective Percentage																					2.75%
SPD Bank [Member] | The SPD 30M Credit Facility [Member]
Debt Instrument, Interest Rate, Stated Percentage								4.32%																		4.32%
SPD Bank [Member] | The $2M Credit Facility [Member]
Debt Instrument, Interest Rate, Stated Percentage							2.59438%
SPD Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] | The $2M Credit Facility [Member]
Debt Instrument, Basis Spread on Variable Rate							1.48%
SPD Bank [Member] | Prime Rate [Member] | The SPD 9.9M Credit Facility [Member]
Debt Instrument, Basis Spread on Variable Rate									0.2475%
SPD Bank [Member] | Prime Rate [Member] | The SPD 30M Credit Facility [Member]
Debt Instrument, Basis Spread on Variable Rate								0.2475%
Revolving Credit Facility [Member] | Branch Banking and Trust Company [Member]
Debt Instrument, Term (Year)																		3 years	3 years
Line of Credit Facility, Maximum Borrowing Capacity			$ 20,000,000									$ 25,000,000						$ 60,000,000	$ 50,000,000
Debt Instrument, Unused Borrowing Capacity, Fee, Percentage			0.30%									0.20%
Line of Credit Facility, Percentage of Maximum Borrowing Capacity, Threshold for Financial Covenants			75.00%									60.00%
Fixed Charge Cover Ratio, Minimum Threshold			1.5
Long-term Line of Credit, Total																				$ 18,700,000
Revolving Credit Facility [Member] | Branch Banking and Trust Company [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate																			1.50%
Revolving Credit Facility [Member] | Branch Banking and Trust Company [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate																		1.40%
Revolving Credit Facility [Member] | Branch Banking and Trust Company [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate																		2.00%
Revolving Credit Facility [Member] | CTBC Bank Co., Ltd. [Member] | Credit Facility with CTBC Bank Co., Ltd [Member] | Prime World International Holdings, Ltd. (“Prime World”) [Member]
Debt Instrument, Term (Year)															1 year
Revolving Credit Facility [Member] | Far Eastern [Member]
Line of Credit Facility, Maximum Borrowing Capacity																				2,668,000		$ 2,668,000
Long-term Debt, Gross																				$ 0		$ 2,668,000
Debt Instrument, Interest Rate, Stated Percentage																				1.70%		1.70%
Revolving Credit Facility [Member] | Far Eastern [Member] | Far Eastern Credit Facility [Member] | Prime World International Holdings, Ltd. (“Prime World”) [Member]
Line of Credit Facility, Maximum Borrowing Capacity											$ 2,600,000																		$ 80,000,000
Debt Instrument, Term of Draw (Day)											180 days
Revolving Credit Facility [Member] | Taishin International Bank [Member] | The NT$100M Credit Line [Member] | Prime World International Holdings, Ltd. (“Prime World”) [Member]
Debt Instrument, Term (Year)				1 year
Line of Credit Facility, Maximum Borrowing Capacity				$ 3,300,000																			$ 100,000,000
Revolving Credit Facility [Member] | Taishin International Bank [Member] | The US $1M Credit Line [Member] | Prime World International Holdings, Ltd. (“Prime World”) [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 1,000,000
Revolving Credit Facility [Member] | Taishin International Bank [Member] | Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity																				$ 3,336,000		$ 3,336,000
Long-term Debt, Gross																				$ 3,375,000		$ 3,336,000
Debt Instrument, Interest Rate, Stated Percentage																				2.20%		2.20%
Revolving Credit Facility [Member] | Taishin International Bank [Member] | Credit Facility [Member] | Prime World International Holdings, Ltd. (“Prime World”) [Member]
Long-term Line of Credit, Total																				$ 3,400,000
Revolving Credit Facility [Member] | Taishin International Bank [Member] | Credit Facility [Member] | Minimum [Member] | Prime World International Holdings, Ltd. (“Prime World”) [Member]
Debt Instrument, Term of Draw (Day)				90 days
Debt Instrument, Interest Rate, Stated Percentage				2.20%																			2.20%
Revolving Credit Facility [Member] | Taishin International Bank [Member] | Credit Facility [Member] | Maximum [Member] | Prime World International Holdings, Ltd. (“Prime World”) [Member]
Debt Instrument, Term of Draw (Day)				120 days
Debt Instrument, Interest Rate, Stated Percentage				2.25%																			2.25%
Revolving Credit Facility [Member] | China Construction Bank Co., Ltd. [Member] | China Merchants Credit Line [Member] | Global Technology, Inc. [Member]
Debt Instrument, Term (Year)										12 months
Line of Credit Facility, Maximum Borrowing Capacity | ¥																												¥ 60,000,000
Revolving Credit Facility [Member] | China Merchants Bank Co, Ltd [Member]
Line of Credit Facility, Maximum Borrowing Capacity																				8,917,000		$ 8,917,000
Long-term Debt, Gross																				$ 977,000		$ 0
Debt Instrument, Interest Rate, Stated Percentage																				4.50%		4.50%
Revolving Credit Facility [Member] | China Merchants Bank Co, Ltd [Member] | China Merchants Credit Line [Member] | Global Technology, Inc. [Member]
Debt Instrument, Term (Year)		6 months
Line of Credit Facility, Maximum Borrowing Capacity										$ 8,900,000
Long-term Line of Credit, Total																				$ 1,000,000
Bank Acceptances Executed																				2,300,000
Revolving Credit Facility [Member] | SPD Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity																				25,449		$ 25,449
Long-term Debt, Gross																				$ 9,698,000		$ 7,919,000
Revolving Credit Facility [Member] | SPD Bank [Member] | Minimum [Member]
Debt Instrument, Interest Rate, Stated Percentage																				3.01%		3.01%
Revolving Credit Facility [Member] | SPD Bank [Member] | Maximum [Member]
Debt Instrument, Interest Rate, Stated Percentage																				4.57%		4.57%
Revolving Credit Facility [Member] | SPD Bank [Member] | The SPD 9.9M Credit Facility [Member] | Global Technology, Inc. [Member]
Debt Instrument, Term (Year)									1 year
Line of Credit Facility, Maximum Borrowing Capacity									$ 1,500,000																		¥ 9,900,000
Revolving Credit Facility [Member] | SPD Bank [Member] | The SPD 30M Credit Facility [Member] | Global Technology, Inc. [Member]
Debt Instrument, Term (Year)								1 year
Line of Credit Facility, Maximum Borrowing Capacity								$ 4,500,000																		¥ 30,000,000
Revolving Credit Facility [Member] | SPD Bank [Member] | The $2M Credit Facility [Member] | Global Technology, Inc. [Member]
Debt Instrument, Term (Year)							6 months
Line of Credit Facility, Maximum Borrowing Capacity							$ 2,000,000
Long-term Line of Credit, Total																				$ 9,700,000
Bank Acceptances Executed																				7,600,000
Revolving Credit Facility [Member] | SPD Bank [Member] | The SPD Credit Line [Member] | Global Technology, Inc. [Member]
Debt Instrument, Term (Year)						5 years
Line of Credit Facility, Maximum Borrowing Capacity						$ 25,400,000																			¥ 180,000,000
Revolving Credit Facility [Member] | China Zheshang Bank Co., Ltd [Member] | The ¥100M Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity																				14,125,000		$ 14,125,000
Long-term Debt, Gross																				$ 4,999,000		$ 0
Debt Instrument, Interest Rate, Stated Percentage																				3.50%		3.50%
Revolving Credit Facility [Member] | China Zheshang Bank Co., Ltd [Member] | The ¥100M Credit Facility [Member] | Global Technology, Inc. [Member]
Debt Instrument, Term (Year)					18 months
Line of Credit Facility, Maximum Borrowing Capacity					$ 14,100,000																			¥ 100,000,000
Long-term Line of Credit, Total																				$ 5,000,000
Bank Acceptances Executed																				0
Revolving Credit Facility [Member] | China Zheshang Bank Co., Ltd [Member] | The ¥50M Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity																				7,167		$ 7,167
Long-term Debt, Gross																				$ 7,063,000		$ 7,167,000
Debt Instrument, Interest Rate, Stated Percentage																				5.70%		5.70%
Revolving Credit Facility [Member] | China Zheshang Bank Co., Ltd [Member] | The ¥50M Credit Facility [Member] | Global Technology, Inc. [Member]
Debt Instrument, Term (Year)					3 years
Line of Credit Facility, Maximum Borrowing Capacity					$ 7,100,000																			¥ 50,000,000
Long-term Line of Credit, Total																				$ 7,100,000

Note 11 - Notes Payable and L_4

Note 11 - Notes Payable and Long-term Debt - Schedule of Notes Payable and Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Long-term debt	$ 57,831	$ 49,985
Less debt issuance costs, net	55	62
Grand total	57,776	49,923
Less current portion	42,234	33,371
Non-current portion	15,542	16,552
Bank acceptance notes issued to vendors with a zero percent interest rate	9,866	6,310
Chailease Finance Co, Ltd. [Member] | Promissory Note [Member]
Long-term debt	3,187	4,262
Chailease Finance Co, Ltd. [Member] | Promissory Note 2 [Member]
Long-term debt	3,562	4,633
Paycheck Protection Program, CARES Act [Member]
Long-term debt	6,229	0
Revolving Credit Facility [Member] | Branch Banking and Trust Company [Member] | Third Amendment to Loan Agreement with BB and T [Member]
Long-term debt	18,741	20,000
Revolving Credit Facility [Member] | Taishin International Bank [Member] | Credit Facility [Member]
Long-term debt	3,375	3,336
Revolving Credit Facility [Member] | Far Eastern [Member]
Long-term debt	0	2,668
Revolving Credit Facility [Member] | China Merchants Bank Co, Ltd [Member]
Long-term debt	977	0
Revolving Credit Facility [Member] | SPD Bank [Member]
Long-term debt	9,698	7,919
Revolving Credit Facility [Member] | China Zheshang Bank Co., Ltd [Member] | The ¥100M Credit Facility [Member]
Long-term debt	4,999	0
Revolving Credit Facility [Member] | China Zheshang Bank Co., Ltd [Member] | The ¥50M Credit Facility [Member]
Long-term debt	$ 7,063	$ 7,167

Note 11 - Notes Payable and L_5

Note 11 - Notes Payable and Long-term Debt - Schedule of Notes Payable and Long-term Debt (Details) (Parentheticals) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 05, 2019	Mar. 30, 2018	Sep. 28, 2017
Chailease Finance Co, Ltd. [Member] | Promissory Note [Member]
Long-term debt, interest	3.40%	3.40%
Debt Instrument, Maturity Date	Nov. 30, 2021	Nov. 30, 2021
Chailease Finance Co, Ltd. [Member] | Promissory Note 2 [Member]
Long-term debt, interest	3.10%	3.10%
Debt Instrument, Maturity Date	Jan. 21, 2022	Jan. 21, 2022
Branch Banking and Trust Company [Member] | Revolving Credit Facility [Member]
Long-term debt, maximum			$ 20,000,000	$ 25,000,000	$ 60,000,000	$ 50,000,000
Far Eastern [Member] | Revolving Credit Facility [Member]
Long-term debt, maximum	$ 2,668,000	$ 2,668,000
Long-term debt, interest	1.70%	1.70%
Debt Instrument, Maturity Date	Apr. 11, 2020	Apr. 11, 2020
China Merchants Bank Co, Ltd [Member] | Revolving Credit Facility [Member]
Long-term debt, maximum	$ 8,917,000	$ 8,917,000
Long-term debt, interest	4.50%	4.50%
Debt Instrument, Maturity Date	Oct. 14, 2020	Oct. 14, 2020
SPD Bank [Member] | Revolving Credit Facility [Member]
Long-term debt, maximum	$ 25,449	$ 25,449
Debt Instrument, Maturity Date	May 24, 2024	May 24, 2024
SPD Bank [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Long-term debt, interest	3.01%	3.01%
SPD Bank [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Long-term debt, interest	4.57%	4.57%
Third Amendment to Loan Agreement with BB and T [Member] | Branch Banking and Trust Company [Member] | Revolving Credit Facility [Member]
Long-term debt, maximum	$ 20,000,000	$ 20,000,000
Long-term debt, interest	1.50%	1.50%
Debt Instrument, Maturity Date	Apr. 2, 2021	Apr. 2, 2021
Paycheck Protection Program, CARES Act [Member]
Long-term debt, interest	1.00%	1.00%
Debt Instrument, Maturity Date	Apr. 16, 2022	Apr. 16, 2022
Credit Facility [Member] | Taishin International Bank [Member] | Revolving Credit Facility [Member]
Long-term debt, maximum	$ 3,336,000	$ 3,336,000
Long-term debt, interest	2.20%	2.20%
Debt Instrument, Maturity Date	Jul. 31, 2020	Jul. 31, 2020
The ¥100M Credit Facility [Member] | China Zheshang Bank Co., Ltd [Member] | Revolving Credit Facility [Member]
Long-term debt, maximum	$ 14,125,000	$ 14,125,000
Long-term debt, interest	3.50%	3.50%
Debt Instrument, Maturity Date	Nov. 7, 2020	Nov. 7, 2020
The ¥50M Credit Facility [Member] | China Zheshang Bank Co., Ltd [Member] | Revolving Credit Facility [Member]
Long-term debt, maximum	$ 7,167	$ 7,167
Long-term debt, interest	5.70%	5.70%
Debt Instrument, Maturity Date	Jun. 20, 2022	Jun. 20, 2022

Note 11 - Notes Payable and L_6

Note 11 - Notes Payable and Long-term Debt - Maturities of Notes Payable and Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
2021	$ 42,234
2022	15,542
Total outstanding	$ 57,776	$ 49,923

Note 12 - Convertible Senior _3

Note 12 - Convertible Senior Notes (Details Textual) - USD ($)	Mar. 05, 2019	Jun. 30, 2020	Dec. 31, 2019
Branch Banking and Trust Company [Member] | CapEx Loan and Term Loan [Member]
Repayments of Long-term Debt, Total	$ 37,800,000
The 5% Convertible Senior Notes Due 2024 [Member]
Debt Instrument, Face Amount	$ 80,500,000	$ 80,500,000	$ 80,500,000
Debt Instrument, Interest Rate, Stated Percentage	5.00%
Proceeds from Convertible Debt	$ 76,400,000
Debt Conversion, Converted Instrument, Shares Issued (in shares)	56.9801
Debt Conversion, Converted Instrument, Amount	$ 1,000
Debt Instrument, Convertible, Conversion Price (in dollars per share)	$ 17.55
Debt Instrument, Convertible, Conversion Price Premium, Percentage	30.00%
Share Price (in dollars per share)	$ 13.50
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger	130.00%
Debt Instrument, Convertible, Threshold Trading Days	20
Debt Instrument, Convertible, Threshold Consecutive Trading Days	30
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed	100.00%
Debt Issuance Costs, Gross	$ 4,100,000

Note 12 - Convertible Senior _4

Note 12 - Convertible Senior Notes - Schedule of Carrying Value of Convertible Senior Notes (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Mar. 05, 2019
Net carrying amount	$ 77,439	$ 77,041
The 5% Convertible Senior Notes Due 2024 [Member]
Principal	80,500	80,500	$ 80,500
Unamortized debt issuance costs	(3,061)	(3,459)
Net carrying amount	$ 77,439	$ 77,041

Note 12 - Convertible Senior _5

Note 12 - Convertible Senior Notes - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Amortization of debt issuance costs			$ 444	$ 457
The 5% Convertible Senior Notes Due 2024 [Member]
Contractual interest expense	$ 1,006	$ 1,006	2,013	1,308
Amortization of debt issuance costs	205	205	414	266
Total interest cost	$ 1,211	$ 1,211	$ 2,427	$ 1,574
Effective interest rate	5.10%	5.10%	5.10%	5.10%

Note 13 - Accrued Liabilities -

Note 13 - Accrued Liabilities - Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accrued payroll	$ 7,737	$ 11,009
Accrued employee benefits	2,484	2,288
Accrued state and local taxes	688	1,215
Accrued interest	1,215	1,208
Advance payments	455	312
Accrued product warranty	785	821
Accrued commission expenses	972	420
Accrued professional fees	232	222
Accrued utility expenses	351	155
Accrued other	638	214
Total accrued liabilities	$ 15,557	$ 17,864

Note 14 - Other Income and Ex_3

Note 14 - Other Income and Expense - Other Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Foreign exchange transaction gain (loss)	$ 113	$ 216	$ 252	$ (17)
Government subsidy income	876	74	981	162
Other non-operating gain (loss)	(6)	161	6	161
Loss on disposal of assets	(9)	0	(9)	(10)
Total other income, net	$ 974	$ 451	$ 1,231	$ 296

Note 15 - Share-based Compens_3

Note 15 - Share-based Compensation (Details Textual) $ in Thousands	6 Months Ended
	Jun. 30, 2020USD ($)
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount	$ 0
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
Share-based Payment Arrangement, Option [Member] | Exercisable on the First Anniversary Date Following the Date of Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Share-based Payment Arrangement, Option [Member] | Exercisable on Semi-annual Basis [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	12.50%
Restricted Stock Awards and Restricted Stock Units [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 23,500
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 6 months 18 days

Note 15 - Share-based Compens_4

Note 15 - Share-based Compensation - Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2020USD ($)$ / sharesshares	Dec. 31, 2019USD ($)$ / shares
Outstanding, number of shares (in shares) | shares	281
Outstanding, weighted average exercise price (in dollars per share)	$ 10.20
Outstanding, weighted average fair value (in dollars per share)	$ 5.32	$ 5.32
Outstanding, aggregate intrinsic value | $	$ 341	$ 573
Exercised, number of shares (in shares) | shares	(1)
Exercised, weighted average exercise price (in dollars per share)	$ 0
Exercised, aggregate intrinsic value | $	$ 0
Outstanding, number of shares (in shares) | shares	280
Outstanding, weighted average exercise price (in dollars per share)	$ 10.22
Outstanding, weighted average remaining contractual life (Year)	3 years 1 month 17 days
Exercisable, number of shares (in shares) | shares	280
Exercisable, weighted average exercise price (in dollars per share)	$ 10.22
Exercisable, weighted average remaining contractual life (Year)	3 years 7 months 13 days
Exercisable, aggregate intrinsic value | $	$ 341
Vested and expected to vest, number of shares (in shares) | shares	280
Vested and expected to vest, weighted average exercise price (in dollars per share)	$ 10.22
Vested and expected to vest, weighted average remaining contractual life (Year)	3 years 1 month 17 days
Vested and expected to vest, aggregate intrinsic value | $	$ 341

Note 15 - Share-based Compens_5

Note 15 - Share-based Compensation - Restricted Stock Unit/Awards Activity (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Outstanding, number of shares (in shares)	770
Outstanding, weighted average fair value (in dollars per share)	$ 25.18
Outstanding, aggregate intrinsic value	$ 18,023	$ 9,143
Granted, number of shares (in shares)	1,181
Granted, weighted average fair value (in dollars per share)	$ 11.41
Granted, aggregate intrinsic value	$ 13,482
Released, number of shares (in shares)	(275)
Released, weighted average share price on date of release (in dollars per share)	$ 10.55
Released, weighted average fair value (in dollars per share)	$ 22.04
Released, aggregate intrinsic value	$ 2,901
Cancelled/Forfeited, number of shares (in shares)	(18)
Cancelled/Forfeited, weighted average fair value (in dollars per share)	$ 17.1
Cancelled/Forfeited, aggregate intrinsic value	$ 191
Outstanding, number of shares (in shares)	1,658
Outstanding, weighted average fair value (in dollars per share)	$ 15.98
Vested and expected to vest, number of shares (in shares)	1,658
Vested and expected to vest, weighted average fair value (in dollars per share)	$ 15.98
Vested and expected to vest, aggregate intrinsic value	$ 18,023

Note 15 - Share-based Compens_6

Note 15 - Share-based Compensation - Share-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Total share-based compensation expense	$ 3,302	$ 3,019	$ 6,540	$ 5,961
Cost of Sales [Member]
Total share-based compensation expense	237	198	483	387
Research and Development Expense [Member]
Total share-based compensation expense	704	657	1,392	1,296
Selling and Marketing Expense [Member]
Total share-based compensation expense	295	279	586	550
General and Administrative Expense [Member]
Total share-based compensation expense	$ 2,066	$ 1,885	$ 4,079	$ 3,728

Note 16 - Income Taxes (Details

Note 16 - Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Effective Income Tax Rate Reconciliation, Percent, Total	258.20%	(22.00%)	16.25%	(20.60%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%	21.00%
TAIWAN, PROVINCE OF CHINA
Deferred Tax Assets, Valuation Allowance, Total	$ 5.2		$ 5.2

Note 17 - Geographic Informat_3

Note 17 - Geographic Information (Details Textual)	6 Months Ended
	Jun. 30, 2020
Number of Reportable Segments	1

Note 17 - Geographic Informat_4

Note 17 - Geographic Information - Revenue Information by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue, net	$ 65,222	$ 43,411	$ 105,689	$ 96,130
UNITED STATES
Revenue, net	4,735	1,652	8,496	3,650
TAIWAN, PROVINCE OF CHINA
Revenue, net	40,604	22,108	64,486	46,128
CHINA
Revenue, net	$ 19,883	$ 19,651	$ 32,707	$ 46,352

Note 17 - Geographic Informat_5

Note 17 - Geographic Information - Asset Information by Geographic Region (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Long-lived assets	$ 261,243	$ 266,010
UNITED STATES
Long-lived assets	93,604	94,507
TAIWAN, PROVINCE OF CHINA
Long-lived assets	72,420	73,816
CHINA
Long-lived assets	$ 95,219	$ 97,687

Note 18 - Contingencies (Detail

Note 18 - Contingencies (Details Textual) $ in Millions	Aug. 03, 2020USD ($)
Subsequent Event [Member]
Loss Contingency, Damages Sought, Value	$ 15.5

Note 19 - Subsequent Events (De

Note 19 - Subsequent Events (Details Textual) - USD ($) $ in Thousands	Jul. 02, 2020	Jun. 30, 2020	Jun. 30, 2019
Repayments of Lines of Credit		$ 48,689	$ 42,211
Revolving Credit Facility [Member] | Branch Banking and Trust Company [Member] | Subsequent Event [Member]
Repayments of Lines of Credit	$ 18,600