Monolithic Power Systems (MPWR) 10-Q 2 Aug 18 2018 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 26, 2018
Document Information [Line Items]
Entity Registrant Name	MONOLITHIC POWER SYSTEMS INC
Entity Central Index Key	1,280,452
Trading Symbol	mpwr
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Entity Common Stock, Shares Outstanding (in shares)		42,299,700
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Amendment Flag	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 83,075	$ 82,759
Short-term investments	230,428	216,331
Accounts receivable	53,460	38,037
Inventories	128,909	99,281
Other current assets	13,974	12,762
Total current assets	509,846	449,170
Property and equipment, net	150,658	144,636
Long-term investments	5,247	5,256
Goodwill	6,571	6,571
Acquisition-related intangible assets, net	504	951
Deferred tax assets, net	15,791	15,917
Other long-term assets	31,335	30,068
Total assets	719,952	652,569
Current liabilities:
Accounts payable	26,689	22,813
Accrued compensation and related benefits	15,604	15,597
Accrued liabilities	33,033	27,507
Total current liabilities	75,326	65,917
Income tax liabilities	30,735	31,621
Other long-term liabilities	34,871	33,024
Total liabilities	140,932	130,562
Commitments and contingencies
Stockholders' equity:
Common stock and additional paid-in capital, $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 42,285 and 41,614 as of June 30, 2018 and December 31, 2017, respectively	417,866	376,586
Retained earnings	162,859	143,608
Accumulated other comprehensive income (loss)	(1,705)	1,813
Total stockholders’ equity	579,020	522,007
Total liabilities and stockholders’ equity	$ 719,952	$ 652,569

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares shares in Thousands	Jun. 30, 2018	Dec. 31, 2017
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	150,000	150,000
Common stock, shares issued (in shares)	42,285	41,614
Common stock, shares outstanding (in shares)	42,285	41,614

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017		Jun. 30, 2018	Jun. 30, 2017
Revenue	$ 139,761	$ 112,198	[1]	$ 268,911	$ 212,560
Cost of revenue	62,197	50,773		119,852	96,293
Gross profit	77,564	61,425		149,059	116,267
Operating expenses:
Research and development	23,481	20,292		45,091	39,186
Selling, general and administrative	28,561	25,873		55,879	47,965
Litigation expense	640	290		1,171	576
Total operating expenses	52,682	46,455		102,141	87,727
Income from operations	24,882	14,970		46,918	28,540
Interest and other income, net	2,232	1,237		2,673	2,618
Income before income taxes	27,114	16,207		49,591	31,158
Income tax provision	2,908	1,193		3,529	1,668
Net income	$ 24,206	$ 15,014		$ 46,062	$ 29,490
Net income per share:
Basic (in dollars per share)	$ 0.57	$ 0.36		$ 1.09	$ 0.72
Diluted (in dollars per share)	$ 0.55	$ 0.35		$ 1.04	$ 0.68
Weighted-average shares outstanding:
Basic (in shares)	42,237	41,323		42,079	41,185
Diluted (in shares)	44,400	43,397		44,341	43,332
Cash dividends declared per common share (in dollars per share)	$ 0.30	$ 0.20		$ 0.60	$ 0.40
[1]	2017 amounts have not been adjusted under the modified retrospective method.

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income	$ 24,206	$ 15,014	$ 46,062	$ 29,490
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of $0 tax in 2018 and 2017	(6,862)	1,186	(2,473)	2,492
Change in unrealized gain (loss) on available-for-sale securities, net of $0 tax in 2018 and 2017	115	141	(1,045)	343
Total other comprehensive income (loss), net of tax	(6,747)	1,327	(3,518)	2,835
Comprehensive income	$ 17,459	$ 16,341	$ 42,544	$ 32,325

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Foreign currency translation adjustments, tax	$ 0	$ 0	$ 0	$ 0
Change in unrealized losses on securities, tax	$ 0	$ 0	$ 0	$ 0

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 46,062	$ 29,490
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of intangible assets	5,830	8,063
Amortization of premium on available-for-sale investments	808	1,005
Gain on deferred compensation plan investments	(233)	(1,266)
Stock-based compensation expense	30,921	26,789
Deferred taxes, net	12
Changes in operating assets and liabilities:
Accounts receivable	(16,325)	(7,729)
Inventories	(29,602)	(21,158)
Other assets	(983)	(1,167)
Accounts payable	3,032	7,755
Accrued compensation and related benefits	103	1,733
Accrued liabilities	539	3,177
Income tax liabilities	1,546	78
Net cash provided by operating activities	41,710	46,770
Cash flows from investing activities:
Property and equipment purchases	(12,998)	(20,528)
Purchases of short-term investments	(67,002)	(93,398)
Proceeds from maturities and sales of short-term investments	51,059	41,809
Contributions to deferred compensation plan, net	(911)	(1,594)
Net cash used in investing activities	(29,852)	(73,711)
Cash flows from financing activities:
Property and equipment purchased on extended payment terms		(250)
Proceeds from exercise of stock options	59	129
Proceeds from vesting of restricted stock units	8,709
Proceeds from shares issued under the employee stock purchase plan	1,562	1,382
Dividends and dividend equivalents paid	(21,467)	(16,815)
Net cash used in financing activities	(11,137)	(15,554)
Effect of change in exchange rates	(407)	909
Net increase (decrease) in cash, cash equivalents and restricted cash	314	(41,586)
Cash, cash equivalents and restricted cash, beginning of period	82,874	112,813
Cash, cash equivalents and restricted cash, end of period	83,188	71,227
Supplemental disclosures:
Cash paid for taxes and interest	3,884	1,583
Non-cash investing and financing activities:
Liability accrued for property and equipment purchases	2,939	974
Liability accrued for dividends and dividend equivalents	$ 14,530	$ 9,536

Note 1 - Basis of Presentation

Note 1 - Basis of Presentation	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. The accompanying unaudited condensed consolidated financial statements have been prepared by Monolithic Power Systems, Inc. (the “Company” or “MPS”) in accordance with the rules and regulations of the Securities and Exchange Commission (the “SEC”). Certain information and disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) have been condensed or omitted in accordance with these accounting principles, rules and regulations. The information in this report should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto included in the Annual Report on Form 10 December 31, 2017, March 1, 2018. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments (consisting only of normal recurring adjustments) necessary to present fairly the Company’s financial position, results of operations and cash flows for the interim periods presented. The financial statements contained in this Form 10 not may December 31, 2018 Summary of Significant Accounting Policies Except for the changes related to revenue recognition discussed in “Recently Adopted Accounting Pronouncements” and in Note 2 no three six June 30, 2018 10 December 31, 2017. Recent ly Adopted Accounting Pronouncement s In May 2014, No. 2014 09, Revenue from Contracts with Customers (Topic 606 January 1, 2018 not December 31, 2017. January 1, 2018 606, not 605, Revenue Recognition The Company recorded a net increase to the opening balance of retained earnings of $0.4 January 1, 2018 606, three 606, 606, January 1, 2018, 2 In November 2016, No. 2016 18, Statement of Cash Flows - Restricted Cash (Topic 230 January 1, 2018 9 Recent Accounting Pronouncement s Not June 30 , 2018 In February 2016, No. 2016 02, Leases (Topic 842 ), 12 December 15, 2018, In June 2016, No. 2016 13, Financial Instruments – Credit Losses (Topic 326 ), December 15, 2019, December 15, 2018. In January 2017, No. 2017 04, Intangibles – Goodwill and Other (Topic 350 ), two not December 15, 2019.

Note 2 - Revenue Recognition

Note 2 - Revenue Recognition	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	2. Revenue from Product Sales The following table presents the Company’s revenue disaggregated by end market (in thousands, except for percentages): Three Months Ended June 30, Six Months Ended June 30, 2018 % of Revenue 2017 (1) % of Revenue 2018 % of Revenue 2017 (1) % of Revenue Consumer $ 47,809 34.2 % $ 43,917 39.1 % $ 94,953 35.3 % $ 79,528 37.4 % Computing and storage 36,957 26.4 24,466 21.8 67,927 25.3 45,083 21.2 Automotive 20,340 14.6 12,854 11.5 38,072 14.2 25,185 11.9 Industrial 19,121 13.7 15,034 13.4 36,676 13.6 30,388 14.3 Communications 15,534 11.1 15,927 14.2 31,283 11.6 32,376 15.2 Total $ 139,761 100.0 % $ 112,198 100.0 % $ 268,911 100.0 % $ 212,560 100.0 % _____________ ( 1 2017 not The Company generates revenue primarily from product sales, which include assembled and tested integrated circuits, as well as dies in wafer form. The Company also generates royalty revenue from licensing arrangements and revenue from wafer testing services performed for third not The Company sells its products primarily through third three June 30, 2018 2017, 86% 88%, six June 30, 2018 2017, 87% 88%, not Under Topic 606, Product sales consist of a single performance obligation that the Company satisfies at a point in time. The Company recognizes product revenue from distributors and direct end customers when the following events have occurred: (a) the Company has transferred physical possession of the products, (b) the Company has a present right to payment, (c) the customer has legal title to the products, and (d) the customer bears significant risks and rewards of ownership of the products. In accordance with the shipping terms specified in the contracts, these criteria are generally met when the products are shipped from the Company’s facilities (such as the “Ex Works” shipping term) or delivered to the customers’ locations (such as the “Delivered Duty Paid” shipping term). Under certain consignment agreements, revenue is not not 60 Variable Consideration The Company records variable consideration as a reduction to revenue in the same period the revenue is recognized. Three U.S.-based distributors have price adjustment rights when they sell the Company’s products to their end customers at a price that is lower than the distribution price invoiced by the Company. When the Company receives claims from the distributors that products have been sold to the end customers at the lower price, the Company issues the distributors credit memos for the price adjustments. The Company estimates the price adjustments based on analyses of historical claims, at both the distributor and product level, as well as an assessment of any known trends of product sales mix. Other U.S. distributors and non-U.S. distributors, which make up the majority of the Company’s total sales to distributors, do not In addition, certain distributors have limited stock rotation rights that permit the return of a small percentage of the previous six Contract Balances The Company records a receivable when it has an unconditional right to receive consideration after the performance obligations are satisfied. As of June 30, 2018 December 31, 2017, $53.5 $38.0 not For certain customers located in Asia, the Company requires cash payments two June 30, 2018 December 31, 2017, $3.2 $4.7 six June 30, 2018 six June 30, 2018, $4.7 December 31, 2017. Contract Costs Warranty The Company generally provides one two no not Practical Expedients The Company’s standard payment terms generally require customers to pay 30 60 one not As of June 30, 2018, not one not Changes to Financial Statement Line Items The following tables compare the impact on the financial statement line items between the application of Topic 606 605 June 30, 2018 three six June 30, 2018. two ● Under Topic 606, three 605, ● Under Topic 606, 605, ● Under Topic 606, 605, not Condensed Consolidated Balance Sheet (in thousands): June 30, 2018 Topic 606 Line Item (As Reported) Topic 605 Difference Assets: Accounts receivable $ 53,460 $ 55,016 $ (1,556 ) Inventories $ 128,909 $ 128,938 $ (29 ) Other current assets $ 13,974 $ 12,927 $ 1,047 Deferred tax assets, net $ 15,791 $ 15,892 $ (101 ) Total assets $ 719,952 $ 720,591 $ (639 ) Liabilities and Stockholders' Equity: Accrued liabilities $ 33,033 $ 34,178 $ (1,145 ) Retained earnings $ 162,859 $ 162,353 $ 506 Total liabilities and stockholders' equity $ 719,952 $ 720,591 $ (639 ) Condensed Consolidated Statement of Operations (in tho usands, except per-share amounts ): Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 Topic 606 Topic 606 Line Item (As Reported) Topic 605 Difference (As Reported) Topic 605 Difference Revenue $ 139,761 $ 139,758 $ 3 $ 268,911 $ 268,717 $ 194 Cost of revenue $ 62,197 $ 62,234 $ (37 ) $ 119,852 $ 119,818 $ 34 Gross profit $ 77,564 $ 77,524 $ 40 $ 149,059 $ 148,899 $ 160 Income from operations $ 24,882 $ 24,842 $ 40 $ 46,918 $ 46,758 $ 160 Income before income taxes $ 27,114 $ 27,074 $ 40 $ 49,591 $ 49,431 $ 160 Income tax provision $ 2,908 $ 2,900 $ 8 $ 3,529 $ 3,496 $ 33 Net income $ 24,206 $ 24,174 $ 32 $ 46,062 $ 45,935 $ 127 Net income per share - diluted $ 0.55 $ 0.54 $ 0.01 $ 1.04 $ 1.04 $ - Condensed Consolidated Statement of Comprehensive Income (in thousands): Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 Topic 606 Topic 606 Line Item (As Reported) Topic 605 Difference (As Reported) Topic 605 Difference Net income $ 24,206 $ 24,174 $ 32 $ 46,062 $ 45,935 $ 127 Comprehensive income $ 17,459 $ 17,427 $ 32 $ 42,544 $ 42,417 $ 127 Condensed Consolidated Statement of Cash Flows (in thousands): Six Months Ended June 30, 2018 Topic 606 Line Item (As Reported) Topic 605 Difference Cash flows from operating activities: Net income $ 46,062 $ 45,935 $ 127 Changes in operating assets and liabilities: Accounts receivable $ (16,325 ) $ (16,980 ) $ 655 Inventories $ (29,602 ) $ (29,631 ) $ 29 Other assets $ (983 ) $ (27 ) $ (956 ) Accrued liabilities $ 539 $ 428 $ 111 Income tax liabilities $ 1,546 $ 1,512 $ 34

Note 3 - Stock-based Compensati

Note 3 - Stock-based Compensation	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	3 . STOCK-BASED COMPENSATION 2014 “2014 The Board of Directors adopted the 2014 April 2013, June 2013. October 2014, 2014 2014 November 13, 2014 5.5 2014 November 13, 2024. June 30, 2018, 2.7 2014 Stock-Based Compensation Expense The Company recognized stock-based compensation expenses as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Cost of revenue $ 480 $ 452 $ 913 $ 810 Research and development 4,194 3,961 8,188 7,459 Selling, general and administrative 11,218 10,714 21,820 18,520 Total stock-based compensation expense $ 15,892 $ 15,127 $ 30,921 $ 26,789 Tax benefit related to stock-based compensation $ 829 $ - $ 1,959 $ - Restricted Stock Units The Company’s restricted stock units (“RSUs”) include time-based RSUs, RSUs with only performance conditions (“PSUs”), RSUs with both market and performance conditions (“MPSUs”), and RSUs with only market conditions (“MSUs”). Vesting of all awards requires continued service for the Company. In addition, vesting of awards with performance conditions or market conditions is subject to the achievement of pre-determined performance goals. A summary of RSU activity is presented in the table below (in thousands, except per-share amounts): Time-Based RSUs Weighted- Average Grant Date Fair Value Per Share PSUs and MPSUs Weighted- Average Grant Date Fair Value Per Share MSUs Weighted- Average Grant Date Fair Value Per Share Total Weighted- Average Grant Date Fair Value Per Share Outstanding at January 1, 2018 258 $ 66.30 2,266 $ 48.59 1,620 $ 23.57 4,144 $ 39.91 Granted 84 $ 113.36 626 (1) $ 81.93 - $ - 710 $ 85.66 Vested (92 ) $ 58.40 (557 ) $ 40.38 - $ - (649 ) $ 42.94 Forfeited (9 ) $ 77.47 (5 ) $ 60.20 - $ - (14 ) $ 71.41 Outstanding at June 30, 2018 241 $ 85.38 2,330 $ 59.49 1,620 $ 23.57 4,191 $ 47.09 ( 1 Amount reflects the number of PSUs and MPSUs that may The intrinsic value related to vested RSUs was $15.6 $11.4 three June 30, 2018 2017, $65.2 $48.8 six June 30, 2018 2017, June 30, 2018, $515.2 $133.67. June 30, 2018, $105.4 three Cash proceeds from vested PSUs with a purchase price feature totaled $8.7 six June 30, 2018. no six June 30, 2017. Time-Based RSUs: For the six June 30, 2018, 84,000 four one 2018 PSUs: In February 2018, 188,000 two 2018 2019 two “2018 300% 2018 50% 2018 first 2020 2018 two 2018 $46.1 In February 2018, 44,000 2019 two 2018 2019 two “2018 200% 300% 2018 50% 2018 first 2020 2018 two 2018 $8.8 The 2018 2018 $30 not not 2018 2018 $110.00, 2.6 27.5% 2.3%. 2015 On December 31, 2015, 86,000 41,000 “2015 500% 2015 2015 four December 31, 2019. first five $71.36 $95.57 January 1, 2016 December 31, 2019. September 30, 2017, five first The second, third fourth five 1 20 2 second $89.56 $106.81 January 1, 2017 December 31, 2019. December 31, 2017, five second third $120.80 $135.48 January 1, 2018 December 31, 2019. June 30, 2018, one third fourth December 31, 2018 January 1, 2019 December 31, 2019. In addition, each of the second, third fourth one six 1. Successful implementation of full digital solutions for certain power products. 2. Successful implementation, and adoption by a key customer, of an integrated, software-based field-oriented control with sensors to motor drivers. 3. Successful implementation of certain advanced power analog processes. 4. Successful design wins and achievement of a specific level of revenue with a global networking customer. 5. Achievement of a specific level of revenue with a global electronics manufacturer. 6. Achievement of a specific level of market share with certain core power products. As of June 30, 2018, none Subject to the employees’ continued employment with the Company, the 2015 January 1, 2020 2015 two The Company determined the grant date fair value of the 2015 $61.35, 33.2%, 1.3%, 7.8% 2015 $24.6 $8.3 first $4.5 second $5.2 third $6.6 fourth For the first third fourth June 30, 2018, three six third fourth . Employee Stock Purchase Plan (“ESPP”) No three June 30, 2018 2017. six June 30, 2018 2017, 18,000 22,000 June 30, 2018, 4.6 The intrinsic value of the shares issued was $0.5 six June 30, 2018 2017. June 30, 2018, $0.1 third 2018. Six Months Ended June 30, 2018 2017 Expected term (years) 0.5 0.5 Expected volatility 28.2 % 23.4 % Risk-free interest rate 1.8 % 0.7 % Dividend yield 1.0 % 0.9 % Cash proceeds from the shares issued under the ESPP were $1.6 $1.4 six June 30, 2018 2017,

Note 4 - Balance Sheet Componen

Note 4 - Balance Sheet Components	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Supplemental Balance Sheet Disclosures [Text Block]	4 . BALANCE SHEET COMPONENTS Inventories Inventories consist of the following (in thousands): June 30, December 31, 2018 2017 Raw materials $ 34,281 $ 20,573 Work in process 50,446 40,030 Finished goods 44,182 38,678 Total $ 128,909 $ 99,281 Other Current Assets Other current assets consist of the following (in thousands): June 30, December 31, 2018 2017 Prepaid wafer purchase $ 6,217 $ 6,217 Other prepaid expense 3,172 2,742 Interest receivable 1,466 1,352 Value-added tax receivable 1,427 1,235 Assets for product returns 1,047 - Other 645 1,216 Total $ 13,974 $ 12,762 Under Topic 606, 606, Other Long-Term Assets Other long-term assets consist of the following (in thousands): June 30, December 31, 2018 2017 Deferred compensation plan assets $ 29,224 $ 28,080 Prepaid expense 816 897 Other 1,295 1,091 Total $ 31,335 $ 30,068 Accrued Liabilities Accrued liabilities consist of the following (in thousands): June 30, December 31, 2018 2017 Dividends and dividend equivalents $ 14,266 $ 9,248 Warranty 3,951 2,416 Stock rotation and sales returns 3,580 2,647 Customer prepayments 3,237 4,742 Income tax payable 3,376 2,861 Commissions 1,112 938 Sales rebate 819 1,036 Deferred income - 1,845 Other 2,692 1,774 Total $ 33,033 $ 27,507 A roll-forward of the warranty reserve is as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Balance at beginning of period $ 3,740 $ 1,346 $ 2,416 $ 1,030 Warranty provision for product sales 335 1,512 1,814 2,303 Settlements made (9 ) - (64 ) (296 ) Unused warranty provision (115 ) (231 ) (215 ) (410 ) Balance at end of period $ 3,951 $ 2,627 $ 3,951 $ 2,627 Other Long-Term Liabilities Other long-term liabilities consist of the following (in thousands): June 30, December 31, 2018 2017 Deferred compensation plan liabilities $ 29,197 $ 28,087 Dividend equivalents 5,595 4,881 Other 79 56 Total $ 34,871 $ 33,024

Note 5 - Goodwill and Acquisiti

Note 5 - Goodwill and Acquisition-related Intangible Assets, Net	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	5 . GOODWILL AND ACQUISITION-RELATED INTAN GIBLE ASSETS , NET There have been no three six June 30, 2018. Acquisition-related intangible assets consist of the following (in thousands): June 30, 2018 Gross Amount Accumulated Amortization Net Amount Know-how $ 1,018 $ (806 ) $ 212 Developed technologies 6,466 (6,174 ) 292 Total $ 7,484 $ (6,980 ) $ 504 December 31, 2017 Gross Amount Accumulated Amortization Net Amount Know-how $ 1,018 $ (704 ) $ 314 Developed technologies 6,466 (5,829 ) 637 Total $ 7,484 $ (6,533 ) $ 951 Amortization expense is recorded in cost of revenue in the Condensed Consolidated Statements of Operations. For the three June 30, 2018 2017, $0.2 $0.5 six June 30, 2018 2017, $0.4 $1.0 As of June 30, 2018, 2018 (remaining six months) $ 394 2019 110 Total $ 504

Note 6 - Net Income Per Share

Note 6 - Net Income Per Share	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Earnings Per Share [Text Block]	6 . NET INCOME PER SHARE Basic net income per share is computed by dividing net income by the weighted-average number of common shares outstanding for the period. Diluted net income per share reflects the potential dilution that would occur if outstanding securities or other contracts to issue common stock were exercised or converted into common shares, and calculated using the treasury stock method. Contingently issuable shares, including equity awards with performance conditions or market conditions, are considered outstanding common shares and included in the basic net income per share as of the date that all necessary conditions to earn the awards have been satisfied. Prior to the end of the contingency period, the number of contingently issuable shares included in the diluted net income per share is based on the number of shares, if any, that would be issuable under the terms of the arrangement at the end of the reporting period. The Company’s outstanding RSUs contain forfeitable rights to receive cash dividend equivalents, which are accumulated and paid to the employees when the underlying RSUs vest. Dividend equivalents accumulated on the underlying RSUs are forfeited if the employees do not not not The following table sets forth the computation of basic and diluted net income per share (in thousands, except per-share amounts): Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Numerator: Net income $ 24,206 $ 15,014 $ 46,062 $ 29,490 Denominator: Weighted-average outstanding shares used to compute basic net income per share 42,237 41,323 42,079 41,185 Effect of dilutive securities 2,163 2,074 2,262 2,147 Weighted-average outstanding shares used to compute diluted net income per share 44,400 43,397 44,341 43,332 Net income per share: Basic $ 0.57 $ 0.36 $ 1.09 $ 0.72 Diluted $ 0.55 $ 0.35 $ 1.04 $ 0.68

Note 7 - Segment and Geographic

Note 7 - Segment and Geographic Information	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	7 . SEGMENT AND GEOGRAPHIC INFORMATION The Company operates in one The Company sells its products primarily through third 10% 10% Revenue Accounts Receivable Three Months Ended June 30, Six Months Ended June 30, June 30, December 31, Customer 2018 2017 2018 2017 2018 2017 A (distributor) 20 % 17 % 20 % 17 % 19 % 16 % B (distributor) 10 % * 10 % * 15 % * C (value-added reseller) * * * * * 15 % __________________ * Represents less than 10%. The Company’s agreements with these third may may not The following is a summary of revenue by geographic regions (in thousands): Three Months Ended June 30, Six Months Ended June 30, Country or Region 2018 2017 2018 2017 China $ 81,207 $ 62,325 $ 154,072 $ 118,409 Taiwan 18,150 17,286 34,541 32,161 Europe 12,651 9,593 24,116 17,501 Korea 8,853 8,154 18,640 16,315 Southeast Asia 7,977 6,925 17,002 13,297 Japan 6,486 4,945 12,100 9,771 United States 4,274 2,888 8,029 4,930 Other 163 82 411 176 Total $ 139,761 $ 112,198 $ 268,911 $ 212,560 The following is a summary of revenue by product family (in thousands): Three Months Ended June 30, Six Months Ended June 30, Product Family 2018 2017 2018 2017 DC to DC $ 127,496 $ 102,187 $ 246,765 $ 193,611 Lighting Control 12,265 10,011 22,146 18,949 Total $ 139,761 $ 112,198 $ 268,911 $ 212,560 The following is a summary of long-lived assets by geographic regions (in thousands): June 30, December 31, Country 2018 2017 China $ 95,152 $ 89,472 United States 67,116 65,618 Taiwan 16,879 17,238 Bermuda 7,075 7,522 Other 736 388 Total $ 186,958 $ 180,238

Note 8 - Litigation

Note 8 - Litigation	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Legal Matters and Contingencies [Text Block]	8 . LITIGATION The Company is a party to actions and proceedings in the ordinary course of business, including potential litigation initiated by its shareholders, challenges to the enforceability or validity of its intellectual property, claims that the Company’s products infringe on the intellectual property rights of others, and employment matters. These proceedings often involve complex questions of fact and law and may June 30, 2018, no

Note 9 - Cash, Cash Equivalents

Note 9 - Cash, Cash Equivalents, Investments and Restricted Cash	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Cash, Cash Equivalents, Investments, and Restricted Cash Disclosure [Text Block]	9 . CASH, CASH EQUIVALENTS, INVESTMENTS AND RESTRICTED CASH The following is a summary of the Company’s cash, cash equivalents and short-term and long-term investments (in thousands): June 30, December 31, 2018 2017 Cash, cash equivalents and investments: Cash $ 66,994 $ 75,125 Money market funds 16,081 7,134 Corporate debt securities 207,461 203,807 U.S. treasuries and government agency bonds 22,967 13,024 Auction-rate securities backed by student-loan notes 5,247 5,256 Total $ 318,750 $ 304,346 June 30, December 31, 2018 2017 Reported as: Cash and cash equivalents $ 83,075 $ 82,759 Short-term investments 230,428 216,331 Long-term investments 5,247 5,256 Total $ 318,750 $ 304,346 The contractual maturities of the Company’s short-term and long-term available-for-sale investments are as follows (in thousands): June 30, December 31, 2018 2017 Due in less than 1 year $ 109,345 $ 89,399 Due in 1 - 5 years 121,083 126,932 Due in greater than 5 years 5,247 5,256 Total $ 235,675 $ 221,587 The following tables summarize the unrealized gain and loss positions related to the Company’s available-for sale investments (in thousands): June 30, 2018 Amortized Cost Unrealized Gains Unrealized Losses Total Fair Value Fair Value of Investments in Unrealized Loss Position Money market funds $ 16,081 $ - $ - $ 16,081 $ - Corporate debt securities 209,385 10 (1,934 ) 207,461 203,215 U.S. treasuries and government agency bonds 23,129 - (162 ) 22,967 22,967 Auction-rate securities backed by student-loan notes 5,570 - (323 ) 5,247 5,247 Total $ 254,165 $ 10 $ (2,419 ) $ 251,756 $ 231,429 December 31, 2017 Amortized Cost Unrealized Gains Unrealized Losses Total Fair Value Fair Value of Investments in Unrealized Loss Position Money market funds $ 7,134 $ - $ - $ 7,134 $ - Corporate debt securities 204,789 17 (999 ) 203,807 197,564 U.S. treasuries and government agency bonds 13,092 - (68 ) 13,024 13,024 Auction-rate securities backed by student-loan notes 5,570 - (314 ) 5,256 5,256 Total $ 230,585 $ 17 $ (1,381 ) $ 229,221 $ 215,844 Restricted Cash The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the Condensed Consolidated Balance Sheets to the amounts shown in the Condensed Consolidated Statements of Cash Flows: June 30, December 31, 2018 2017 Cash and cash equivalents $ 83,075 $ 82,759 Restricted cash included in other long-term assets 113 115 Total cash, cash equivalents and restricted cash shown in the Condensed Consolidated Statements of Cash Flows $ 83,188 $ 82,874 Restricted cash includes a security deposit that is set aside in a bank account and cannot be withdrawn by the Company under the terms of a lease agreement. The restriction will end and any unused amount will be returned to the Company upon the expiration of the lease.

Note 10 - Fair Value Measuremen

Note 10 - Fair Value Measurements	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Fair Value Disclosures [Text Block]	10 . FAIR VALUE MEASUR E MENTS The following table details the fair value measurement of the financial assets (in thousands): Fair Value Measurement at June 30, 2018 Total Level 1 Level 2 Level 3 Money market funds $ 16,081 $ 16,081 $ - $ - Corporate debt securities 207,461 - 207,461 - U.S. treasuries and government agency bonds 22,967 - 22,967 - Auction-rate securities backed by student-loan notes 5,247 - - 5,247 Mutual funds and money market funds under deferred compensation plan 17,113 17,113 - - Total $ 268,869 $ 33,194 $ 230,428 $ 5,247 Fair Value Measurement at December 31, 2017 Total Level 1 Level 2 Level 3 Money market funds $ 7,134 $ 7,134 $ - $ - Corporate debt securities 203,807 - 203,807 - U.S. treasuries and government agency bonds 13,024 - 13,024 - Auction-rate securities backed by student-loan notes 5,256 - - 5,256 Mutual funds and money market funds under deferred compensation plan 16,625 16,625 - - Total $ 245,846 $ 23,759 $ 216,831 $ 5,256 ______________ ● Level 1—includes ● Level 2—includes may third ● Level 3—includes The Company’s level 3 2008. Balance at January 1, 2018 $ 5,256 Change in unrealized loss included in other comprehensive income (9 ) Balance at June 30, 2018 $ 5,247 The Company determined the fair value of the auction-rate securities using a discounted cash flow model with the following assumptions: June 30, December 31, 2018 2017 Time-to-liquidity (years) 2 - 3 2 - 3 Discount rate 5.3% - 10.3% 4.5% - 9.6%

Note 11 - Deferred Compensation

Note 11 - Deferred Compensation Plan	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Compensation and Employee Benefit Plans [Text Block]	11 . DEFERRED COMPENSATION PLAN The following table summarizes the deferred compensation plan balances in the Condensed Consolidated Balance Sheets (in thousands): June 30, December 31, 2018 2017 Deferred compensation plan asset components: Cash surrender value of corporate-owned life insurance policies $ 12,111 $ 11,455 Fair value of mutual funds and money market funds 17,113 16,625 Total $ 29,224 $ 28,080 Deferred compensation plan assets reported in: Other long-term assets $ 29,224 $ 28,080 Deferred compensation plan liabilities reported in: Accrued compensation and related benefits (short-term) $ 447 $ 356 Other long-term liabilities 29,197 28,087 Total $ 29,644 $ 28,443

Note 12 - Interest and Other In

Note 12 - Interest and Other Income, Net	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Other Nonoperating Income and Expense [Text Block]	12 . INTEREST AND OTHER INCOME, NET The components of interest and other income, net are as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Interest income $ 1,563 $ 1,327 $ 3,024 $ 2,591 Amortization of premium on available-for-sale investments (374 ) (498 ) (808 ) (1,005 ) Gain on deferred compensation plan investments 419 533 233 1,266 Foreign currency exchange gain (loss) 614 (125 ) 214 (234 ) Other 10 - 10 - Total $ 2,232 $ 1,237 $ 2,673 $ 2,618

Note 13 - Income Taxes

Note 13 - Income Taxes	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Income Tax Disclosure [Text Block]	13 . INCOME TAXES The Company has not December 2017 ( “2017 fourth 2017. June 30, 2018 No. 118, December 2018 The income tax provision for the three six June 30, 2018 $2.9 10.7% $3.5 7.1% 2017 For the three six June 30, 2018, $15.5 $27.9 first 2018, 2018 $1.9 June 30, 2018, $1.9 $20.1 The income tax provision for the three six June 30, 2017 $1.2 7.4% $1.7 5.4% As of June 30, 2018, $17.2 $10.5 December 31, 2017, $16.3 $9.1 Uncertain tax positions relate to the allocation of income and deductions among the Company’s global entities and to the determination of the research and development tax credit. It is reasonably possible that over the next twelve may not The Company recognizes interest and penalties, if any, related to uncertain tax positions in its income tax provision. As of June 30, 2018 December 31, 2017, $0.7 $0.5

Note 14 - Accumulated Other Com

Note 14 - Accumulated Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Comprehensive Income (Loss) Note [Text Block]	14 . ACCUMU LATED OTHER COMPREHENSIVE INCOME (LOSS) The following table summarizes the changes in accumulated other comprehensive income (loss) (in thousands): Unrealized Losses on Available-for- Sale Securities Foreign Currency Translation Adjustments Total Balance as of January 1, 2018 $ (1,364 ) $ 3,177 $ 1,813 Other comprehensive income (loss) before reclassifications (1,185 ) 4,389 3,204 Amounts reclassified from accumulated other comprehensive income 25 - 25 Net current period other comprehensive income (loss) (1,160 ) 4,389 3,229 Balance as of March 31, 2018 (2,524 ) 7,566 5,042 Other comprehensive income (loss) before reclassifications 94 (6,862 ) (6,768 ) Amounts reclassified from accumulated other comprehensive income (loss) 21 - 21 Net current period other comprehensive income (loss) 115 (6,862 ) (6,747 ) Balance as of June 30, 2018 $ (2,409 ) $ 704 $ (1,705 ) The amounts reclassified from accumulated other comprehensive income (loss) were recorded in interest and other income, net, in the Condensed Consolidated Statements of Operations.

Note 15 - Dividends and Dividen

Note 15 - Dividends and Dividend Equivalents	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Dividends And Dividend Equivalents [Text Block]	1 5 . DIVIDENDS AND DIVIDEND EQUIVALENTS Cash Dividend Program In June 2014, Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Dividend declared per share $ 0.30 $ 0.20 $ 0.60 $ 0.40 Total amount $ 12,686 $ 8,273 $ 25,330 $ 16,521 As of June 30, 2018 December 31, 2017, $12.7 $8.3 The declaration of any future cash dividends is at the discretion of the Board of Directors and will depend on, among other things, the Company’s financial condition, results of operations, capital requirements, business conditions, statutory requirements of Delaware law, and other factors that the Board of Directors may The Company anticipates that cash used for future dividend payments will come from its current domestic cash and cash generated from ongoing U.S. operations, as well as cash to be repatriated from its Bermuda subsidiary. Earnings from other foreign subsidiaries will continue to be indefinitely reinvested. Cash Dividend Equivalent Rights Under the Company’s stock plans, outstanding RSUs contain rights to receive cash dividend equivalents, which entitle employees who hold RSUs to the same dividend value per share as holders of common stock. The dividend equivalents are accumulated and paid to the employees when the underlying RSUs vest. Dividend equivalents accumulated on the underlying RSUs are forfeited if the employees do not not June 30, 2018 December 31, 2017, $7.2 $5.8

Note 16 - Subsequent Event

Note 16 - Subsequent Event	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Subsequent Events [Text Block]	16. On July 24, 2018, 2015 Altera v. Commissioner not , not

Significant Accounting Policies

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	The accompanying unaudited condensed consolidated financial statements have been prepared by Monolithic Power Systems, Inc. (the “Company” or “MPS”) in accordance with the rules and regulations of the Securities and Exchange Commission (the “SEC”). Certain information and disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) have been condensed or omitted in accordance with these accounting principles, rules and regulations. The information in this report should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto included in the Annual Report on Form 10 December 31, 2017, March 1, 2018. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments (consisting only of normal recurring adjustments) necessary to present fairly the Company’s financial position, results of operations and cash flows for the interim periods presented. The financial statements contained in this Form 10 not may December 31,2018
New Accounting Pronouncements, Policy [Policy Text Block]	Recent ly Adopted Accounting Pronouncement s In May 2014, No. 2014 09, Revenue from Contracts with Customers (Topic 606 January 1, 2018 not December 31, 2017. January 1, 2018 606, not 605, Revenue Recognition The Company recorded a net increase to the opening balance of retained earnings of $0.4 January 1, 2018 606, three 606, 606, January 1, 2018, 2 In November 2016, No. 2016 18, Statement of Cash Flows - Restricted Cash (Topic 230 January 1, 2018 9 Recent Accounting Pronouncement s Not June 30 , 2018 In February 2016, No. 2016 02, Leases (Topic 842 ), 12 December 15, 2018, In June 2016, No. 2016 13, Financial Instruments – Credit Losses (Topic 326 ), December 15, 2019, December 15, 2018. In January 2017, No. 2017 04, Intangibles – Goodwill and Other (Topic 350 ), two not December 15, 2019.

Note 2 - Revenue Recognition (T

Note 2 - Revenue Recognition (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Disaggregation of Revenue [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2018 % of Revenue 2017 (1) % of Revenue 2018 % of Revenue 2017 (1) % of Revenue Consumer $ 47,809 34.2 % $ 43,917 39.1 % $ 94,953 35.3 % $ 79,528 37.4 % Computing and storage 36,957 26.4 24,466 21.8 67,927 25.3 45,083 21.2 Automotive 20,340 14.6 12,854 11.5 38,072 14.2 25,185 11.9 Industrial 19,121 13.7 15,034 13.4 36,676 13.6 30,388 14.3 Communications 15,534 11.1 15,927 14.2 31,283 11.6 32,376 15.2 Total $ 139,761 100.0 % $ 112,198 100.0 % $ 268,911 100.0 % $ 212,560 100.0 %
Accounting Standards Update 2014-09 [Member]
Notes Tables
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]	June 30, 2018 Topic 606 Line Item (As Reported) Topic 605 Difference Assets: Accounts receivable $ 53,460 $ 55,016 $ (1,556 ) Inventories $ 128,909 $ 128,938 $ (29 ) Other current assets $ 13,974 $ 12,927 $ 1,047 Deferred tax assets, net $ 15,791 $ 15,892 $ (101 ) Total assets $ 719,952 $ 720,591 $ (639 ) Liabilities and Stockholders' Equity: Accrued liabilities $ 33,033 $ 34,178 $ (1,145 ) Retained earnings $ 162,859 $ 162,353 $ 506 Total liabilities and stockholders' equity $ 719,952 $ 720,591 $ (639 ) Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 Topic 606 Topic 606 Line Item (As Reported) Topic 605 Difference (As Reported) Topic 605 Difference Revenue $ 139,761 $ 139,758 $ 3 $ 268,911 $ 268,717 $ 194 Cost of revenue $ 62,197 $ 62,234 $ (37 ) $ 119,852 $ 119,818 $ 34 Gross profit $ 77,564 $ 77,524 $ 40 $ 149,059 $ 148,899 $ 160 Income from operations $ 24,882 $ 24,842 $ 40 $ 46,918 $ 46,758 $ 160 Income before income taxes $ 27,114 $ 27,074 $ 40 $ 49,591 $ 49,431 $ 160 Income tax provision $ 2,908 $ 2,900 $ 8 $ 3,529 $ 3,496 $ 33 Net income $ 24,206 $ 24,174 $ 32 $ 46,062 $ 45,935 $ 127 Net income per share - diluted $ 0.55 $ 0.54 $ 0.01 $ 1.04 $ 1.04 $ - Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 Topic 606 Topic 606 Line Item (As Reported) Topic 605 Difference (As Reported) Topic 605 Difference Net income $ 24,206 $ 24,174 $ 32 $ 46,062 $ 45,935 $ 127 Comprehensive income $ 17,459 $ 17,427 $ 32 $ 42,544 $ 42,417 $ 127 Six Months Ended June 30, 2018 Topic 606 Line Item (As Reported) Topic 605 Difference Cash flows from operating activities: Net income $ 46,062 $ 45,935 $ 127 Changes in operating assets and liabilities: Accounts receivable $ (16,325 ) $ (16,980 ) $ 655 Inventories $ (29,602 ) $ (29,631 ) $ 29 Other assets $ (983 ) $ (27 ) $ (956 ) Accrued liabilities $ 539 $ 428 $ 111 Income tax liabilities $ 1,546 $ 1,512 $ 34

Note 3 - Stock-based Compensa26

Note 3 - Stock-based Compensation (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Cost of revenue $ 480 $ 452 $ 913 $ 810 Research and development 4,194 3,961 8,188 7,459 Selling, general and administrative 11,218 10,714 21,820 18,520 Total stock-based compensation expense $ 15,892 $ 15,127 $ 30,921 $ 26,789 Tax benefit related to stock-based compensation $ 829 $ - $ 1,959 $ -
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]	Time-Based RSUs Weighted- Average Grant Date Fair Value Per Share PSUs and MPSUs Weighted- Average Grant Date Fair Value Per Share MSUs Weighted- Average Grant Date Fair Value Per Share Total Weighted- Average Grant Date Fair Value Per Share Outstanding at January 1, 2018 258 $ 66.30 2,266 $ 48.59 1,620 $ 23.57 4,144 $ 39.91 Granted 84 $ 113.36 626 (1) $ 81.93 - $ - 710 $ 85.66 Vested (92 ) $ 58.40 (557 ) $ 40.38 - $ - (649 ) $ 42.94 Forfeited (9 ) $ 77.47 (5 ) $ 60.20 - $ - (14 ) $ 71.41 Outstanding at June 30, 2018 241 $ 85.38 2,330 $ 59.49 1,620 $ 23.57 4,191 $ 47.09
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]	Six Months Ended June 30, 2018 2017 Expected term (years) 0.5 0.5 Expected volatility 28.2 % 23.4 % Risk-free interest rate 1.8 % 0.7 % Dividend yield 1.0 % 0.9 %

Note 4 - Balance Sheet Compon27

Note 4 - Balance Sheet Components (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Schedule of Inventory, Current [Table Text Block]	June 30, December 31, 2018 2017 Raw materials $ 34,281 $ 20,573 Work in process 50,446 40,030 Finished goods 44,182 38,678 Total $ 128,909 $ 99,281
Schedule of Other Current Assets [Table Text Block]	June 30, December 31, 2018 2017 Prepaid wafer purchase $ 6,217 $ 6,217 Other prepaid expense 3,172 2,742 Interest receivable 1,466 1,352 Value-added tax receivable 1,427 1,235 Assets for product returns 1,047 - Other 645 1,216 Total $ 13,974 $ 12,762
Schedule of Other Assets, Noncurrent [Table Text Block]	June 30, December 31, 2018 2017 Deferred compensation plan assets $ 29,224 $ 28,080 Prepaid expense 816 897 Other 1,295 1,091 Total $ 31,335 $ 30,068
Schedule of Accrued Liabilities [Table Text Block]	June 30, December 31, 2018 2017 Dividends and dividend equivalents $ 14,266 $ 9,248 Warranty 3,951 2,416 Stock rotation and sales returns 3,580 2,647 Customer prepayments 3,237 4,742 Income tax payable 3,376 2,861 Commissions 1,112 938 Sales rebate 819 1,036 Deferred income - 1,845 Other 2,692 1,774 Total $ 33,033 $ 27,507
Schedule of Product Warranty Liability [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Balance at beginning of period $ 3,740 $ 1,346 $ 2,416 $ 1,030 Warranty provision for product sales 335 1,512 1,814 2,303 Settlements made (9 ) - (64 ) (296 ) Unused warranty provision (115 ) (231 ) (215 ) (410 ) Balance at end of period $ 3,951 $ 2,627 $ 3,951 $ 2,627
Other Noncurrent Liabilities [Table Text Block]	June 30, December 31, 2018 2017 Deferred compensation plan liabilities $ 29,197 $ 28,087 Dividend equivalents 5,595 4,881 Other 79 56 Total $ 34,871 $ 33,024

Note 5 - Goodwill and Acquisi28

Note 5 - Goodwill and Acquisition-related Intangible Assets, Net (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]	June 30, 2018 Gross Amount Accumulated Amortization Net Amount Know-how $ 1,018 $ (806 ) $ 212 Developed technologies 6,466 (6,174 ) 292 Total $ 7,484 $ (6,980 ) $ 504 December 31, 2017 Gross Amount Accumulated Amortization Net Amount Know-how $ 1,018 $ (704 ) $ 314 Developed technologies 6,466 (5,829 ) 637 Total $ 7,484 $ (6,533 ) $ 951
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	2018 (remaining six months) $ 394 2019 110 Total $ 504

Note 6 - Net Income Per Share (

Note 6 - Net Income Per Share (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Numerator: Net income $ 24,206 $ 15,014 $ 46,062 $ 29,490 Denominator: Weighted-average outstanding shares used to compute basic net income per share 42,237 41,323 42,079 41,185 Effect of dilutive securities 2,163 2,074 2,262 2,147 Weighted-average outstanding shares used to compute diluted net income per share 44,400 43,397 44,341 43,332 Net income per share: Basic $ 0.57 $ 0.36 $ 1.09 $ 0.72 Diluted $ 0.55 $ 0.35 $ 1.04 $ 0.68

Note 7 - Segment and Geograph30

Note 7 - Segment and Geographic Information (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Schedule of Revenue and Accounts Receivable by Major Customers by Reporting Segments [Table Text Block]	Revenue Accounts Receivable Three Months Ended June 30, Six Months Ended June 30, June 30, December 31, Customer 2018 2017 2018 2017 2018 2017 A (distributor) 20 % 17 % 20 % 17 % 19 % 16 % B (distributor) 10 % * 10 % * 15 % * C (value-added reseller) * * * * * 15 %
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, Country or Region 2018 2017 2018 2017 China $ 81,207 $ 62,325 $ 154,072 $ 118,409 Taiwan 18,150 17,286 34,541 32,161 Europe 12,651 9,593 24,116 17,501 Korea 8,853 8,154 18,640 16,315 Southeast Asia 7,977 6,925 17,002 13,297 Japan 6,486 4,945 12,100 9,771 United States 4,274 2,888 8,029 4,930 Other 163 82 411 176 Total $ 139,761 $ 112,198 $ 268,911 $ 212,560
Revenue from External Customers by Products and Services [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, Product Family 2018 2017 2018 2017 DC to DC $ 127,496 $ 102,187 $ 246,765 $ 193,611 Lighting Control 12,265 10,011 22,146 18,949 Total $ 139,761 $ 112,198 $ 268,911 $ 212,560
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]	June 30, December 31, Country 2018 2017 China $ 95,152 $ 89,472 United States 67,116 65,618 Taiwan 16,879 17,238 Bermuda 7,075 7,522 Other 736 388 Total $ 186,958 $ 180,238

Note 9 - Cash, Cash Equivalen31

Note 9 - Cash, Cash Equivalents, Investments and Restricted Cash (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Fair Value, by Balance Sheet Grouping [Table Text Block]	June 30, December 31, 2018 2017 Cash, cash equivalents and investments: Cash $ 66,994 $ 75,125 Money market funds 16,081 7,134 Corporate debt securities 207,461 203,807 U.S. treasuries and government agency bonds 22,967 13,024 Auction-rate securities backed by student-loan notes 5,247 5,256 Total $ 318,750 $ 304,346 June 30, December 31, 2018 2017 Reported as: Cash and cash equivalents $ 83,075 $ 82,759 Short-term investments 230,428 216,331 Long-term investments 5,247 5,256 Total $ 318,750 $ 304,346
Investments Classified by Contractual Maturity Date [Table Text Block]	June 30, December 31, 2018 2017 Due in less than 1 year $ 109,345 $ 89,399 Due in 1 - 5 years 121,083 126,932 Due in greater than 5 years 5,247 5,256 Total $ 235,675 $ 221,587
Unrealized Gain (Loss) on Investments [Table Text Block]	June 30, 2018 Amortized Cost Unrealized Gains Unrealized Losses Total Fair Value Fair Value of Investments in Unrealized Loss Position Money market funds $ 16,081 $ - $ - $ 16,081 $ - Corporate debt securities 209,385 10 (1,934 ) 207,461 203,215 U.S. treasuries and government agency bonds 23,129 - (162 ) 22,967 22,967 Auction-rate securities backed by student-loan notes 5,570 - (323 ) 5,247 5,247 Total $ 254,165 $ 10 $ (2,419 ) $ 251,756 $ 231,429 December 31, 2017 Amortized Cost Unrealized Gains Unrealized Losses Total Fair Value Fair Value of Investments in Unrealized Loss Position Money market funds $ 7,134 $ - $ - $ 7,134 $ - Corporate debt securities 204,789 17 (999 ) 203,807 197,564 U.S. treasuries and government agency bonds 13,092 - (68 ) 13,024 13,024 Auction-rate securities backed by student-loan notes 5,570 - (314 ) 5,256 5,256 Total $ 230,585 $ 17 $ (1,381 ) $ 229,221 $ 215,844
Restrictions on Cash and Cash Equivalents [Table Text Block]	June 30, December 31, 2018 2017 Cash and cash equivalents $ 83,075 $ 82,759 Restricted cash included in other long-term assets 113 115 Total cash, cash equivalents and restricted cash shown in the Condensed Consolidated Statements of Cash Flows $ 83,188 $ 82,874

Note 10 - Fair Value Measurem32

Note 10 - Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	Fair Value Measurement at June 30, 2018 Total Level 1 Level 2 Level 3 Money market funds $ 16,081 $ 16,081 $ - $ - Corporate debt securities 207,461 - 207,461 - U.S. treasuries and government agency bonds 22,967 - 22,967 - Auction-rate securities backed by student-loan notes 5,247 - - 5,247 Mutual funds and money market funds under deferred compensation plan 17,113 17,113 - - Total $ 268,869 $ 33,194 $ 230,428 $ 5,247 Fair Value Measurement at December 31, 2017 Total Level 1 Level 2 Level 3 Money market funds $ 7,134 $ 7,134 $ - $ - Corporate debt securities 203,807 - 203,807 - U.S. treasuries and government agency bonds 13,024 - 13,024 - Auction-rate securities backed by student-loan notes 5,256 - - 5,256 Mutual funds and money market funds under deferred compensation plan 16,625 16,625 - - Total $ 245,846 $ 23,759 $ 216,831 $ 5,256
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	Balance at January 1, 2018 $ 5,256 Change in unrealized loss included in other comprehensive income (9 ) Balance at June 30, 2018 $ 5,247
Schedule Of Level 3 Assumptions [Table Text Block]	June 30, December 31, 2018 2017 Time-to-liquidity (years) 2 - 3 2 - 3 Discount rate 5.3% - 10.3% 4.5% - 9.6%

Note 11 - Deferred Compensati33

Note 11 - Deferred Compensation Plan (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Schedule of Deferred Compensation Plan [Table Text Block]	June 30, December 31, 2018 2017 Deferred compensation plan asset components: Cash surrender value of corporate-owned life insurance policies $ 12,111 $ 11,455 Fair value of mutual funds and money market funds 17,113 16,625 Total $ 29,224 $ 28,080 Deferred compensation plan assets reported in: Other long-term assets $ 29,224 $ 28,080 Deferred compensation plan liabilities reported in: Accrued compensation and related benefits (short-term) $ 447 $ 356 Other long-term liabilities 29,197 28,087 Total $ 29,644 $ 28,443

Note 12 - Interest and Other 34

Note 12 - Interest and Other Income, Net (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Schedule of Other Nonoperating Income (Expense) [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Interest income $ 1,563 $ 1,327 $ 3,024 $ 2,591 Amortization of premium on available-for-sale investments (374 ) (498 ) (808 ) (1,005 ) Gain on deferred compensation plan investments 419 533 233 1,266 Foreign currency exchange gain (loss) 614 (125 ) 214 (234 ) Other 10 - 10 - Total $ 2,232 $ 1,237 $ 2,673 $ 2,618

Note 14 - Accumulated Other C35

Note 14 - Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	Unrealized Losses on Available-for- Sale Securities Foreign Currency Translation Adjustments Total Balance as of January 1, 2018 $ (1,364 ) $ 3,177 $ 1,813 Other comprehensive income (loss) before reclassifications (1,185 ) 4,389 3,204 Amounts reclassified from accumulated other comprehensive income 25 - 25 Net current period other comprehensive income (loss) (1,160 ) 4,389 3,229 Balance as of March 31, 2018 (2,524 ) 7,566 5,042 Other comprehensive income (loss) before reclassifications 94 (6,862 ) (6,768 ) Amounts reclassified from accumulated other comprehensive income (loss) 21 - 21 Net current period other comprehensive income (loss) 115 (6,862 ) (6,747 ) Balance as of June 30, 2018 $ (2,409 ) $ 704 $ (1,705 )

Note 15 - Dividends and Divid36

Note 15 - Dividends and Dividend Equivalents (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Dividends Declared [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Dividend declared per share $ 0.30 $ 0.20 $ 0.60 $ 0.40 Total amount $ 12,686 $ 8,273 $ 25,330 $ 16,521

Note 1 - Basis of Presentation

Note 1 - Basis of Presentation (Details Textual) $ in Millions	Jan. 01, 2018USD ($)
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 0.4

Note 2 - Revenue Recognition (D

Note 2 - Revenue Recognition (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Number of Reportable Segments			1
Lapse Period for Consignment			60 days
Accounts Receivable, Net, Current, Total	$ 53,460		$ 53,460		$ 38,037
Allowance for Doubtful Accounts Receivable, Write-offs			$ 0		0
Revenue, Performance Obligation, Performance Period Following Prepayment			90 days
Minimum [Member]
Contract with Customer, Payment Term			30 days
Maximum [Member]
Contract with Customer, Payment Term			60 days
Certain Customers in China [Member]
Contract with Customer, Payment Term Required Prior to Shipping Products			14 days
Contract with Customer, Liability, Revenue Recognized			$ 4,700
Certain Customers in China [Member] | Accrued Liabilities, Current [Member]
Contract with Customer, Liability, Current	$ 3,200		$ 3,200		$ 4,700
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Distributor Sales [Member]
Concentration Risk, Percentage	86.00%	88.00%	87.00%	88.00%

Note 2 - Revenue Recognition -

Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017		Jun. 30, 2018	Jun. 30, 2017
Revenue	$ 139,761	$ 112,198	[1]	$ 268,911	$ 212,560
Percentage of revenue	100.00%	100.00%		100.00%	100.00%
Consumer Market [Member]
Revenue	$ 47,809	$ 43,917	[1]	$ 94,953	$ 79,528
Percentage of revenue	34.20%	39.10%		35.30%	37.40%
Computing and Storage Market [Member]
Revenue	$ 36,957	$ 24,466	[1]	$ 67,927	$ 45,083
Percentage of revenue	26.40%	21.80%		25.30%	21.20%
Automotive Market [Member]
Revenue	$ 20,340	$ 12,854	[1]	$ 38,072	$ 25,185
Percentage of revenue	14.60%	11.50%		14.20%	11.90%
Industrial Market [Member]
Revenue	$ 19,121	$ 15,034	[1]	$ 36,676	$ 30,388
Percentage of revenue	13.70%	13.40%		13.60%	14.30%
Communications Market [Member]
Revenue	$ 15,534	$ 15,927	[1]	$ 31,283	$ 32,376
Percentage of revenue	11.10%	14.20%		11.60%	15.20%
[1]	2017 amounts have not been adjusted under the modified retrospective method.

Note 2 - Revenue Recognition 40

Note 2 - Revenue Recognition - Impact of Topic 606 (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017		Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Accounts receivable	$ 53,460			$ 53,460		$ 38,037
Inventories	128,909			128,909		99,281
Other current assets	13,974			13,974		12,762
Deferred tax assets, net	15,791			15,791		15,917
Total assets	719,952			719,952		652,569
Accrued liabilities	33,033			33,033		27,507
Retained earnings	162,859			162,859		143,608
Total liabilities and stockholders' equity	719,952			719,952		$ 652,569
Revenue	139,761	$ 112,198	[1]	268,911	$ 212,560
Cost of revenue	62,197	50,773		119,852	96,293
Gross profit	77,564	61,425		149,059	116,267
Income from operations	24,882	14,970		46,918	28,540
Income before income taxes	27,114	16,207		49,591	31,158
Income tax provision	2,908	1,193		3,529	1,668
Net income	$ 24,206	$ 15,014		$ 46,062	$ 29,490
Net income per share - diluted (in dollars per share)	$ 0.55	$ 0.35		$ 1.04	$ 0.68
Comprehensive income	$ 17,459	$ 16,341		$ 42,544	$ 32,325
Accounts receivable				(16,325)	(7,729)
Inventories				(29,602)	(21,158)
Other assets				(983)	(1,167)
Accrued liabilities				539	3,177
Income tax liabilities				1,546	$ 78
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Accounts receivable	55,016			55,016
Inventories	128,938			128,938
Other current assets	12,927			12,927
Deferred tax assets, net	15,892			15,892
Total assets	720,591			720,591
Accrued liabilities	34,178			34,178
Retained earnings	162,353			162,353
Total liabilities and stockholders' equity	720,591			720,591
Revenue	139,758			268,717
Cost of revenue	62,234			119,818
Gross profit	77,524			148,899
Income from operations	24,842			46,758
Income before income taxes	27,074			49,431
Income tax provision	2,900			3,496
Net income	$ 24,174			$ 45,935
Net income per share - diluted (in dollars per share)	$ 0.54			$ 1.04
Comprehensive income	$ 17,427			$ 42,417
Accounts receivable				(16,980)
Inventories				(29,631)
Other assets				(27)
Accrued liabilities				428
Income tax liabilities				1,512
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Accounts receivable	(1,556)			(1,556)
Inventories	(29)			(29)
Other current assets	1,047			1,047
Deferred tax assets, net	(101)			(101)
Total assets	(639)			(639)
Accrued liabilities	(1,145)			(1,145)
Retained earnings	506			506
Total liabilities and stockholders' equity	(639)			(639)
Revenue	3			194
Cost of revenue	(37)			34
Gross profit	40			160
Income from operations	40			160
Income before income taxes	40			160
Income tax provision	8			33
Net income	$ 32			$ 127
Net income per share - diluted (in dollars per share)	$ 0.01
Comprehensive income	$ 32			$ 127
Accounts receivable				655
Inventories				29
Other assets				(956)
Accrued liabilities				111
Income tax liabilities				$ 34
[1]	2017 amounts have not been adjusted under the modified retrospective method.

Note 3 - Stock-based Compensa41

Note 3 - Stock-based Compensation (Details Textual) $ / shares in Units, $ in Thousands	Dec. 31, 2015$ / sharesshares	Feb. 28, 2018USD ($)$ / sharesshares	Dec. 31, 2015$ / shares	Jun. 30, 2018USD ($)$ / sharesshares	Jun. 30, 2017USD ($)shares	Jun. 30, 2018USD ($)$ / sharesshares	Jun. 30, 2017USD ($)shares	Sep. 30, 2017	Dec. 31, 2015USD ($)$ / shares	Nov. 13, 2014shares
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options						$ 8,709
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares						710,000
Proceeds from Stock Plans						$ 1,562	1,382
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested				$ 15,600	$ 11,400	65,200	48,800
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding				$ 515,200		$ 515,200
Share Price | $ / shares				$ 133.67		$ 133.67
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total				$ 105,400		$ 105,400
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition						3 years
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options						$ 8,700	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares						84,000
Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares						84,000
Time-Based RSUs [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period						4 years
Time-Based RSUs [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period						1 year
PSU 2018 [Member] | Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares		188,000
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Measurement Period of Relative Revenue Growth Rate to Industry Average		2 years
PSUs Earn-Out Percentage		300.00%
Maximum Stock Compensation Costs		$ 46,100
PSU 2018 [Member] | Executive Officer [Member] | Vesting First Quarter of 2020 if Performance Conditions are Met [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		50.00%
PSU 2018 [Member] | Executive Officer [Member] | Quarterly Vesting of Awards Not Based on Performance [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		2 years
PSU 2018 [Member] | Non-Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares		44,000
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Measurement Period of Relative Revenue Growth Rate to Industry Average		2 years
Maximum Stock Compensation Costs		$ 8,800
PSU 2018 [Member] | Non-Executive Employees [Member] | Minimum [Member]
PSUs Earn-Out Percentage		200.00%
PSU 2018 [Member] | Non-Executive Employees [Member] | Maximum [Member]
PSUs Earn-Out Percentage		300.00%
PSU 2018 [Member] | Non-Executive Employees [Member] | Vesting First Quarter of 2020 if Performance Conditions are Met [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		50.00%
PSU 2018 [Member] | Non-Executive Employees [Member] | Annual or Quarterly Vesting of Awards Not Based on Performance [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		2 years
2018 Executive PSUs and 2018 Non-executive PSUs [Member]
Share Price | $ / shares		$ 110
Share-based Compensation Arrangement by Share-based Payment Award, Price Per Share Payable Upon Vesting of Equity Instruments Other than Options | $ / shares		$ 30
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		2 years 219 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		27.50%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		2.30%
2015 MPSUs [Member]
Share Price | $ / shares	$ 61.35		$ 61.35						$ 61.35
PSUs Earn-Out Percentage			500.00%
Maximum Stock Compensation Costs									$ 24,600
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate									33.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate									1.30%
Number of MPSU Tranches			4
Share-based Compensation Arrangement by Share-based Payment Award, Post-Award Vesting Period, Restriction Period on Sales			2 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions									7.80%
2015 MPSUs [Member] | Share-based Compensation Award, Tranche One [Member]
Maximum Stock Compensation Costs									$ 8,300
Number of Price Targets			5
Stock Price Targets Achieved								5
2015 MPSUs [Member] | Share-based Compensation Award, Tranche One [Member] | Minimum [Member]
Market Awards Price Targets | $ / shares			$ 71.36
2015 MPSUs [Member] | Share-based Compensation Award, Tranche One [Member] | Maximum [Member]
Market Awards Price Targets | $ / shares			$ 95.57
2015 MPSUs [Member] | Second, Third, and Fourth Tranches [Member]
Number of Price Targets			5
Total number of performance conditions			6
2015 MPSUs [Member] | Share-based Compensation Award, Tranche Two [Member]
Maximum Stock Compensation Costs									4,500
2015 MPSUs [Member] | Share-based Compensation Award, Tranche Two [Member] | Minimum [Member]
Market Awards Price Targets | $ / shares			$ 89.56
2015 MPSUs [Member] | Share-based Compensation Award, Tranche Two [Member] | Maximum [Member]
Market Awards Price Targets | $ / shares			106.81
2015 MPSUs [Member] | Share-based Compensation Award, Tranche Three [Member]
Maximum Stock Compensation Costs									5,200
2015 MPSUs [Member] | Share-based Compensation Award, Tranche Three [Member] | Minimum [Member]
Market Awards Price Targets | $ / shares			120.80
2015 MPSUs [Member] | Share-based Compensation Award, Tranche Three [Member] | Maximum [Member]
Market Awards Price Targets | $ / shares			$ 135.48
2015 MPSUs [Member] | Share-based Compensation Award, Tranche Four [Member]
Maximum Stock Compensation Costs									$ 6,600
2015 MPSUs [Member] | Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares	86,000
2015 MPSUs [Member] | Non-Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares	41,000
The2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares										5,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares				2,700,000		2,700,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares				4,600,000		4,600,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total				$ 100		$ 100
Stock Issued During Period, Shares, Employee Stock Purchase Plans | shares				0	0	18,000	22,000
Employee Stock Purchase Plan Shares Issued, Intrinsic Value						$ 500	$ 500
Proceeds from Stock Plans						$ 1,600	$ 1,400

Note 3 - Stock-based Compensa42

Note 3 - Stock-based Compensation - Stock-based Compensation Plan Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Share based compensation expense	$ 15,892	$ 15,127	$ 30,921	$ 26,789
Tax benefit related to stock-based compensation	829		1,959
Cost of Sales [Member]
Share based compensation expense	480	452	913	810
Research and Development Expense [Member]
Share based compensation expense	4,194	3,961	8,188	7,459
Selling, General and Administrative Expenses [Member]
Share based compensation expense	$ 11,218	$ 10,714	$ 21,820	$ 18,520

Note 3 - Stock-based Compensa43

Note 3 - Stock-based Compensation - RSU Summary (Details) shares in Thousands	6 Months Ended
	Jun. 30, 2018$ / sharesshares
Beginning balance (in shares) | shares	4,144
Weighted-Average Grant Date Fair Value Per Share, beginning balance (in dollars per share) | $ / shares	$ 39.91
Granted (in shares) | shares	710
Weighted-Average Grant Date Fair Value Per Share, granted (in dollars per share) | $ / shares	$ 85.66
Vested (in shares) | shares	(649)
Weighted-Average Grant Date Fair Value Per Share, vested (in dollars per share) | $ / shares	$ 42.94
Forfeited (in shares) | shares	(14)
Weighted-Average Grant Date Fair Value Per Share, forfeited (in dollars per share) | $ / shares	$ 71.41
Ending balance (in shares) | shares	4,191
Weighted-Average Grant Date Fair Value Per Share, ending balance (in dollars per share) | $ / shares	$ 47.09
Time-Based RSUs [Member]
Beginning balance (in shares) | shares	258
Weighted-Average Grant Date Fair Value Per Share, beginning balance (in dollars per share) | $ / shares	$ 66.30
Granted (in shares) | shares	84
Weighted-Average Grant Date Fair Value Per Share, granted (in dollars per share) | $ / shares	$ 113.36
Vested (in shares) | shares	(92)
Weighted-Average Grant Date Fair Value Per Share, vested (in dollars per share) | $ / shares	$ 58.40
Forfeited (in shares) | shares	(9)
Weighted-Average Grant Date Fair Value Per Share, forfeited (in dollars per share) | $ / shares	$ 77.47
Ending balance (in shares) | shares	241
Weighted-Average Grant Date Fair Value Per Share, ending balance (in dollars per share) | $ / shares	$ 85.38
PSUs and MPSUs [Member]
Beginning balance (in shares) | shares	2,266
Weighted-Average Grant Date Fair Value Per Share, beginning balance (in dollars per share) | $ / shares	$ 48.59
Granted (in shares) | shares	626	[1]
Weighted-Average Grant Date Fair Value Per Share, granted (in dollars per share) | $ / shares	$ 81.93
Vested (in shares) | shares	(557)
Weighted-Average Grant Date Fair Value Per Share, vested (in dollars per share) | $ / shares	$ 40.38
Forfeited (in shares) | shares	(5)
Weighted-Average Grant Date Fair Value Per Share, forfeited (in dollars per share) | $ / shares	$ 60.20
Ending balance (in shares) | shares	2,330
Weighted-Average Grant Date Fair Value Per Share, ending balance (in dollars per share) | $ / shares	$ 59.49
MSUs [Member]
Beginning balance (in shares) | shares	1,620
Weighted-Average Grant Date Fair Value Per Share, beginning balance (in dollars per share) | $ / shares	$ 23.57
Granted (in shares) | shares		[1]
Weighted-Average Grant Date Fair Value Per Share, granted (in dollars per share) | $ / shares
Vested (in shares) | shares
Weighted-Average Grant Date Fair Value Per Share, vested (in dollars per share) | $ / shares
Forfeited (in shares) | shares
Weighted-Average Grant Date Fair Value Per Share, forfeited (in dollars per share) | $ / shares
Ending balance (in shares) | shares	1,620
Weighted-Average Grant Date Fair Value Per Share, ending balance (in dollars per share) | $ / shares	$ 23.57
[1]	Amount reflects the number of PSUs and MPSUs that may ultimately be earned based on management's probability assessment of the achievement of performance conditions at each reporting period. In addition, MPSUs are subject to the achievement of market conditions.

Note 3 - Stock-based Compensa44

Note 3 - Stock-based Compensation - Valuation Assumptions (Details) - 2004 Employee Stock Plan [Member] - Employee Stock Purchase Plan [Member]	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Expected term (years) (Year)	182 days	182 days
Expected volatility	28.20%	23.40%
Risk-free interest rate	1.80%	0.70%
Dividend yield	1.00%	0.90%

Note 4 - Balance Sheet Compon45

Note 4 - Balance Sheet Components - Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Raw materials	$ 34,281	$ 20,573
Work in process	50,446	40,030
Finished goods	44,182	38,678
Total	$ 128,909	$ 99,281

Note 4 - Balance Sheet Compon46

Note 4 - Balance Sheet Components - Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Prepaid wafer purchase	$ 6,217	$ 6,217
Other prepaid expense	3,172	2,742
Interest receivable	1,466	1,352
Value-added tax receivable	1,427	1,235
Assets for product returns	1,047
Other	645	1,216
Total	$ 13,974	$ 12,762

Note 4 - Balance Sheet Compon47

Note 4 - Balance Sheet Components - Other Long-term Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Deferred compensation plan assets	$ 29,224	$ 28,080
Prepaid expense	816	897
Other	1,295	1,091
Total	$ 31,335	$ 30,068

Note 4 - Balance Sheet Compon48

Note 4 - Balance Sheet Components - Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Dividends and dividend equivalents	$ 14,266	$ 9,248
Warranty	3,951	2,416
Stock rotation and sales returns	3,580	2,647
Customer prepayments	3,237	4,742
Income tax payable	3,376	2,861
Commissions	1,112	938
Sales rebate	819	1,036
Deferred income		1,845
Other	2,692	1,774
Total	$ 33,033	$ 27,507

Note 4 - Balance Sheet Compon49

Note 4 - Balance Sheet Components - Roll-forward of the Warranty Reserve (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Balance	$ 3,740	$ 1,346	$ 2,416	$ 1,030
Warranty provision for product sales	335	1,512	1,814	2,303
Settlements made	(9)		(64)	(296)
Unused warranty provision	(115)	(231)	(215)	(410)
Balance	$ 3,951	$ 2,627	$ 3,951	$ 2,627

Note 4 - Balance Sheet Compon50

Note 4 - Balance Sheet Components - Long-term Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Deferred compensation plan liabilities	$ 29,197	$ 28,087
Dividend equivalents	5,595	4,881
Other	79	56
Total	$ 34,871	$ 33,024

Note 5 - Goodwill and Acquisi51

Note 5 - Goodwill and Acquisition-related Intangible Assets, Net (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Goodwill, Period Increase (Decrease), Total	$ 0		$ 0
Cost Of Revenue [Member]
Amortization of Intangible Assets, Total	$ 200	$ 500	$ 400	$ 1,000

Note 5 - Goodwill and Acquisi52

Note 5 - Goodwill and Acquisition-related Intangible Assets, Net - Acquisition-related Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Gross Amount	$ 7,484	$ 7,484
Accumulated Amortization	(6,980)	(6,533)
Net Amount	504	951
Know-How [Member]
Gross Amount	1,018	1,018
Accumulated Amortization	(806)	(704)
Net Amount	212	314
Developed Technology Rights [Member]
Gross Amount	6,466	6,466
Accumulated Amortization	(6,174)	(5,829)
Net Amount	$ 292	$ 637

Note 5 - Goodwill and Acquisi53

Note 5 - Goodwill and Acquisition-related Intangible Assets, Net - Future Amortization Expense (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
2018 (remaining six months)	$ 394
2,019	110
Total	$ 504	$ 951

Note 6 - Net Income Per Share -

Note 6 - Net Income Per Share - Net Income Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income	$ 24,206	$ 15,014	$ 46,062	$ 29,490
Weighted-average shares outstanding, basic (in shares)	42,237	41,323	42,079	41,185
Effect of dilutive securities (in shares)	2,163	2,074	2,262	2,147
Weighted-average shares outstanding, diluted (in shares)	44,400	43,397	44,341	43,332
Earnings per share, basic (in dollars per share)	$ 0.57	$ 0.36	$ 1.09	$ 0.72
Earnings per share, diluted (in dollars per share)	$ 0.55	$ 0.35	$ 1.04	$ 0.68

Note 7 - Segment and Geograph55

Note 7 - Segment and Geographic Information (Details Textual)	6 Months Ended
	Jun. 30, 2018
Number of Reportable Segments	1

Note 7 - Segment and Geograph56

Note 7 - Segment and Geographic Information - Customers with Sales and Accounts Receivable Greater Than 10% (Details) - Customer Concentration Risk [Member]		3 Months Ended			6 Months Ended				12 Months Ended
		Jun. 30, 2018	Jun. 30, 2017		Jun. 30, 2018		Jun. 30, 2017		Dec. 31, 2017
Distributor A [Member] | Sales Revenue, Net [Member]
Concentration risk		20.00%	17.00%		20.00%		17.00%
Distributor A [Member] | Accounts Receivable [Member]
Concentration risk					19.00%				16.00%
Distributor B [Member] | Sales Revenue, Net [Member]
Concentration risk		10.00%		[1]	10.00%			[1]
Distributor B [Member] | Accounts Receivable [Member]
Concentration risk					15.00%					[1]
Distributor C [Member] | Sales Revenue, Net [Member]
Concentration risk	[1]
Distributor C [Member] | Accounts Receivable [Member]
Concentration risk						[1]			15.00%
[1]	Represents less than 10%.

Note 7 - Segment and Geograph57

Note 7 - Segment and Geographic Information - Revenue by Region (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017		Jun. 30, 2018	Jun. 30, 2017
Revenue	$ 139,761	$ 112,198	[1]	$ 268,911	$ 212,560
CHINA
Revenue	81,207	62,325		154,072	118,409
TAIWAN, PROVINCE OF CHINA
Revenue	18,150	17,286		34,541	32,161
Europe [Member]
Revenue	12,651	9,593		24,116	17,501
KOREA, REPUBLIC OF
Revenue	8,853	8,154		18,640	16,315
South East Asia [Member]
Revenue	7,977	6,925		17,002	13,297
JAPAN
Revenue	6,486	4,945		12,100	9,771
UNITED STATES
Revenue	4,274	2,888		8,029	4,930
Other Region [Member]
Revenue	$ 163	$ 82		$ 411	$ 176
[1]	2017 amounts have not been adjusted under the modified retrospective method.

Note 7 - Segment and Geograph58

Note 7 - Segment and Geographic Information - Revenue by Product Family (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017		Jun. 30, 2018	Jun. 30, 2017
Revenue	$ 139,761	$ 112,198	[1]	$ 268,911	$ 212,560
DC To DC Products [Member]
Revenue	127,496	102,187		246,765	193,611
Lighting Control Products [Member]
Revenue	$ 12,265	$ 10,011		$ 22,146	$ 18,949
[1]	2017 amounts have not been adjusted under the modified retrospective method.

Note 7 - Segment and Geograph59

Note 7 - Segment and Geographic Information - Long Lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Long lived assets by region	$ 186,958	$ 180,238
CHINA
Long lived assets by region	95,152	89,472
UNITED STATES
Long lived assets by region	67,116	65,618
TAIWAN, PROVINCE OF CHINA
Long lived assets by region	16,879	17,238
BERMUDA
Long lived assets by region	7,075	7,522
Other Region [Member]
Long lived assets by region	$ 736	$ 388

Note 9 - Cash, Cash Equivalen60

Note 9 - Cash, Cash Equivalents, Investments and Restricted Cash - Cash Equivalents, Short-term and Long-term Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Cash	$ 66,994	$ 75,125
Money market funds	16,081	7,134
U.S. treasuries and government agency bonds	22,967	13,024
Total	318,750	304,346
Cash and cash equivalents	83,075	82,759
Short-term investments	230,428	216,331
Long-term investments	5,247	5,256
Corporate Debt Securities [Member]
Available-for-sale securities	207,461	203,807
Auction Rate Securities [Member]
Available-for-sale securities	$ 5,247	$ 5,256

Note 9 - Cash, Cash Equivalen61

Note 9 - Cash, Cash Equivalents, Investments and Restricted Cash - Investment Maturity Classification (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Due in less than 1 year	$ 109,345	$ 89,399
Due in 1 - 5 years	121,083	126,932
Due in greater than 5 years	5,247	5,256
Total	$ 235,675	$ 221,587

Note 9 - Cash, Cash Equivalen62

Note 9 - Cash, Cash Equivalents, Investments and Restricted Cash - Unrealized Gains and Losses on Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Adjusted Cost	$ 254,165	$ 230,585
Total Fair Value	251,756	229,221
Unrealized Gains	10	17
Unrealized Losses	(2,419)	(1,381)
Fair Value of Investments in Unrealized Loss Position	231,429	215,844
Money Market Funds [Member]
Adjusted Cost	16,081	7,134
Total Fair Value	16,081	7,134
Corporate Debt Securities [Member]
Adjusted Cost	209,385	204,789
Total Fair Value	207,461	203,807
Unrealized Gains	10	17
Unrealized Losses	(1,934)	(999)
Fair Value of Investments in Unrealized Loss Position	203,215	197,564
US Government Agencies Short-term Debt Securities [Member]
Adjusted Cost	23,129	13,092
Total Fair Value	22,967	13,024
Unrealized Losses	(162)	(68)
Fair Value of Investments in Unrealized Loss Position	22,967	13,024
Auction Rate Securities [Member]
Adjusted Cost	5,570	5,570
Total Fair Value	5,247	5,256
Unrealized Losses	(323)	(314)
Fair Value of Investments in Unrealized Loss Position	$ 5,247	$ 5,256

Note 9 - Cash, Cash Equivalen63

Note 9 - Cash, Cash Equivalents, Investments and Restricted Cash - Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Cash and cash equivalents	$ 83,075	$ 82,759
Restricted cash included in other long-term assets	113	115
Total cash, cash equivalents and restricted cash shown in the Condensed Consolidated Statements of Cash Flows	$ 83,188	$ 82,874	$ 71,227	$ 112,813

Note 10 - Fair Value Measurem64

Note 10 - Fair Value Measurements - Financial Assets and Liabilities, Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Total Fair Value	$ 251,756	$ 229,221
Assets, fair value	268,869	245,846
Fair Value, Inputs, Level 1 [Member]
Assets, fair value	33,194	23,759
Fair Value, Inputs, Level 2 [Member]
Assets, fair value	230,428	216,831
Fair Value, Inputs, Level 3 [Member]
Assets, fair value	5,247	5,256
Money Market Funds [Member]
Total Fair Value	16,081	7,134
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Total Fair Value	16,081	7,134
Corporate Debt Securities [Member]
Total Fair Value	207,461	203,807
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Total Fair Value	207,461	203,807
US Government Agencies Short-term Debt Securities [Member]
Total Fair Value	22,967	13,024
US Government Agencies Short-term Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Total Fair Value	22,967	13,024
Auction Rate Securities [Member]
Total Fair Value	5,247	5,256
Auction Rate Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Total Fair Value	5,247	5,256
Mutual Fund [Member]
Total Fair Value	17,113	16,625
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Total Fair Value	$ 17,113	$ 16,625

Note 10 - Fair Value Measurem65

Note 10 - Fair Value Measurements - Level 3 Investments (Details) - Auction Rate Securities [Member] $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)
Balance, auction rate securities	$ 5,256
Change in unrealized loss included in other comprehensive income (loss)	(9)
Balance, auction rate securities	$ 5,247

Note 10 - Fair Value Measurem66

Note 10 - Fair Value Measurements - Discounted Cash Flow Assumptions (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Minimum [Member]
Time-to-liquidity (years) (Year)	2 years	2 years
Discount rate	5.30%	4.50%
Maximum [Member]
Time-to-liquidity (years) (Year)	3 years	3 years
Discount rate	10.30%	9.60%

Note 11 - Deferred Compensati67

Note 11 - Deferred Compensation Plan - Summary of Deferred Compensation Plan (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Deferred compensation plan assets	$ 29,224	$ 28,080
Deferred compensation plan liabilities	29,644	28,443
Other Long-term Assets [Member]
Deferred compensation plan assets	29,224	28,080
Accrued Compensation and Related Benefits [Member]
Deferred compensation plan liabilities	447	356
Other Long-term Liabilities [Member]
Deferred compensation plan liabilities	29,197	28,087
Cash Surrender Value [Member]
Deferred compensation plan assets	12,111	11,455
Mutual Funds and Money Market Funds, Fair Value [Member]
Deferred compensation plan assets	$ 17,113	$ 16,625

Note 12 - Interest and Other 68

Note 12 - Interest and Other Income, Net - Interest and Other Income Components (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest income	$ 1,563	$ 1,327	$ 3,024	$ 2,591
Amortization of premium on available-for-sale investments	(374)	(498)	(808)	(1,005)
Gain on deferred compensation plan investments	419	533	233	1,266
Foreign currency exchange gain (loss)	614	(125)	214	(234)
Other	10		10
Total	$ 2,232	$ 1,237	$ 2,673	$ 2,618

Note 13 - Income Taxes (Details

Note 13 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Expense (Benefit), Total	$ 2,908		$ 1,193	$ 3,529	$ 1,668
Effective Income Tax Rate Reconciliation, Percent, Total	10.70%		7.40%	7.10%	5.40%
GILTI Tax	$ 15,500			$ 27,900
Payment for the Transition Tax		$ 1,900
Unrecognized Tax Benefits, Ending Balance	17,200			17,200		$ 16,300
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	10,500			10,500		9,100
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	700			700		$ 500
Accrued Liabilities, Current [Member]
Transition Tax Liability	1,900			1,900
Income Tax Liabilities, Noncurrent [Member]
Transition Tax Liability	$ 20,100			$ 20,100

Note 14 - Accumulated Other C70

Note 14 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Mar. 31, 2018
Balance		$ 522,007
Balance	$ 579,020
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Balance	(2,524)	(1,364)
Other comprehensive income (loss) before reclassifications	94	(1,185)
Amounts reclassified from accumulated other comprehensive income	21	25
Net current period other comprehensive income (loss)	115	(1,160)
Balance	(2,409)	(2,524)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	7,566	3,177
Other comprehensive income (loss) before reclassifications	(6,862)	4,389
Amounts reclassified from accumulated other comprehensive income
Net current period other comprehensive income (loss)	(6,862)	4,389
Balance	704	7,566
AOCI Attributable to Parent [Member]
Balance	5,042	1,813
Other comprehensive income (loss) before reclassifications	(6,768)	3,204
Amounts reclassified from accumulated other comprehensive income	21	25
Net current period other comprehensive income (loss)	(6,747)	3,229
Balance	$ (1,705)	$ 5,042

Note 15 - Dividends and Divid71

Note 15 - Dividends and Dividend Equivalents (Details Textual) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Dividends Payable, Current	$ 12.7	$ 8.3
Accrued Dividend Equivalents	$ 7.2	$ 5.8

Note 15 - Dividends and Divid72

Note 15 - Dividends and Dividend Equivalents - Cash Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Cash dividends declared per common share (in dollars per share)	$ 0.30	$ 0.20	$ 0.60	$ 0.40
Total amount	$ 12,686	$ 8,273	$ 25,330	$ 16,521