Proto Labs (PRLB) 10-Q 30 Oct 18 2018 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 24, 2018
Document Information [Line Items]
Entity Registrant Name	Proto Labs Inc
Entity Central Index Key	1,443,669
Trading Symbol	prlb
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding (in shares)		27,070,318
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Amendment Flag	false

Consolidated Balance Sheets (Cu

Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 62,593	$ 36,707
Short-term marketable securities	57,561	57,424
Accounts receivable, net of allowance for doubtful accounts of $949 and $757 as of September 30, 2018 and December 31, 2017, respectively	62,131	51,503
Inventory	9,608	11,271
Prepaid expenses and other current assets	8,639	6,267
Income taxes receivable		1,832
Total current assets	200,532	165,004
Property and equipment, net	210,053	166,440
Goodwill	128,752	128,504
Other intangible assets, net	19,713	19,084
Long-term marketable securities	33,224	37,034
Other long-term assets	3,590	2,672
Total assets	595,864	518,738
Liabilities and shareholders' equity
Accounts payable	17,300	15,876
Accrued compensation	14,462	12,100
Accrued liabilities and other	14,843	8,408
Short-term debt obligations		5,000
Income taxes payable	2,763	2,371
Total current liabilities	49,368	43,755
Long-term income taxes payable	2,181	2,181
Long-term deferred tax liabilities	8,732	6,966
Other long-term liabilities	4,377	4,621
Total liabilities	64,658	57,523
Shareholders' equity
Preferred stock, $0.001 par value, authorized 10,000,000 shares; issued and outstanding 0 shares as of each of September 30, 2018 and December 31, 2017
Common stock, $0.001 par value, authorized 150,000,000 shares; issued and outstanding 27,068,068 and 26,828,651 shares as of September 30, 2018 and December 31, 2017, respectively	27	27
Additional paid-in capital	254,957	241,725
Retained earnings	283,460	224,697
Accumulated other comprehensive loss	(7,238)	(5,234)
Total shareholders' equity	531,206	461,215
Total liabilities and shareholders' equity	$ 595,864	$ 518,738

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Allowance for doubtful accounts	$ 949	$ 757
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	27,068,068	26,828,651
Common stock, shares outstanding (in shares)	27,068,068	26,828,651

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statements of Operations:
Revenue	$ 115,430	$ 88,105	$ 332,827	$ 250,312
Cost of revenue	53,027	38,793	153,303	109,358
Gross profit	62,403	49,312	179,524	140,954
Operating expenses
Marketing and sales	16,818	13,846	50,947	41,463
Research and development	7,458	5,877	21,155	17,784
General and administrative	13,096	10,222	38,679	28,256
Total operating expenses	37,372	29,945	110,781	87,503
Income from operations	25,031	19,367	68,743	53,451
Other income, net	390	291	1,376	1,779
Income before income taxes	25,421	19,658	70,119	55,230
Provision for income taxes	4,484	6,438	12,817	17,724
Net income	$ 20,937	$ 13,220	$ 57,302	$ 37,506
Net income per share:
Basic (in dollars per share)	$ 0.77	$ 0.50	$ 2.13	$ 1.41
Diluted (in dollars per share)	$ 0.77	$ 0.49	$ 2.10	$ 1.40
Shares used to compute net income per share:
Basic (in shares)	27,038,585	26,617,349	26,963,205	26,600,174
Diluted (in shares)	27,337,886	26,802,034	27,268,311	26,716,553
Comprehensive Income (net of tax)
Comprehensive income	$ 20,058	$ 14,875	$ 55,298	$ 42,510

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating activities
Net income	$ 57,302	$ 37,506
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	19,520	13,539
Stock-based compensation expense	7,986	6,159
Deferred taxes	1,770	715
Gain on sale of business	(671)
Amortization of held-to-maturity securities	336	851
Other	160	21
Changes in operating assets and liabilities:
Accounts receivable	(8,993)	(10,679)
Inventories	324	(188)
Prepaid expenses and other	(2,058)	(1,147)
Income taxes	2,278	4,158
Accounts payable	980	1,387
Accrued liabilities and other	6,028	6,678
Net cash provided by operating activities	84,962	59,000
Investing activities
Purchases of property, equipment and other capital assets	(61,898)	(24,164)
Cash used for acquisitions, net of cash acquired	(90)
Proceeds from sale of business	284
Purchases of marketable securities	(41,384)	(20,037)
Proceeds from maturities of marketable securities	44,721	34,090
Purchases of other assets and investments	(126)	(514)
Net cash used in investing activities	(58,493)	(10,625)
Financing activities
Payments on debt	(5,000)
Proceeds from exercises of stock options and other	5,248	5,749
Repurchases of common stock		(4,410)
Net cash provided by financing activities	248	1,339
Effect of exchange rate changes on cash and cash equivalents	(831)	774
Net increase in cash and cash equivalents	25,886	50,488
Cash and cash equivalents, beginning of period	36,707	68,795
Cash and cash equivalents, end of period	$ 62,593	$ 119,283

Note 1 - Basis of Presentation

Note 1 - Basis of Presentation	9 Months Ended
	Sep. 30, 2018
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	Note 1 The unaudited interim Consolidated Financial Statements of Proto Labs, Inc. (Protolabs, the Company, we, us or our) have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) for interim financial information and with the instructions to Form 10 10 X. not may The preparation of the financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses, and the related disclosures at the date of the financial statements and during the reporting period. Actual results could materially differ from these estimates. For further information, refer to the audited Consolidated Financial Statements and Notes thereto included in the Company’s Annual Report on Form 10 December 31, 2017 February 23, 2018. The accompanying Consolidated Balance Sheet as of December 31, 2017 not 10 10 February 23, 2018

Note 2 - Recent Accounting Pron

Note 2 - Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2018
Notes to Financial Statements
Significant Accounting Policies [Text Block]	Note 2 Recently Adopted Accounting Pronouncements During the first 2018, 2014 09, Revenue from Contracts with Customers 606 no two $1.5 January 1, 2018. During the first 2018, 2017 09, Compensation – Stock Compensation not Recently Issued Accounting Pronouncements In February 2016, 2016 02, Leases December 15, 2018 840, Leases not In January 2017, 2017 04, Intangibles – Goodwill and Other, December 15, 2019 not

Note 3 - Revenue

Note 3 - Revenue	9 Months Ended
	Sep. 30, 2018
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	Note 3 The Company’s significant accounting policies are disclosed in Note 2 10 December 31, 2017. 606 Revenue Recognition The Company provides quality, quick-turn prototyping and on-demand manufacturing services. As a result, the majority of revenue recognized in a reporting period is based on completed, invoiced contracts. The Company accounts for revenue in accordance with ASC 606, January 1, 2018, January 1, 2018 606, not 605. $1.5 January 1, 2018 606. 606 $1.3 $0.6 three September 30, 2018, $1.3 $0.6 September 30, 2018. nine September 30, 2018 606 $1.5 $0.7 $4.0 $1.8 September 30, 2018, $1.5 A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account in ASC 606. 3D one second The Company manufactures parts that have no two Revenue by geographic region for the three nine September 30, 2018 2017 Three Months Ended September 30, Nine Months Ended September 30, (in thousands) 2018 2017 2018 2017 Revenue: United States $ 90,732 $ 67,490 $ 261,253 $ 191,019 Europe 21,273 18,094 61,431 51,224 Japan 3,425 2,521 10,143 8,069 Total revenue $ 115,430 $ 88,105 $ 332,827 $ 250,312 Revenue by product line for the three nine September 30, 2018 2017 Three Months Ended September 30, Nine Months Ended September 30, (in thousands) 2018 2017 2018 2017 Revenue: Injection Molding $ 53,681 $ 49,480 $ 156,610 $ 144,187 CNC Machining 40,845 27,166 115,364 73,318 3D Printing 13,845 11,102 39,418 32,061 Sheet Metal 6,452 - 19,002 - Other Revenue 607 357 2,433 746 Total revenue $ 115,430 $ 88,105 $ 332,827 $ 250,312 The Company generally expenses sales commissions when incurred because the amortization period would have been one one not

Note 4 - Net Income Per Common

Note 4 - Net Income Per Common Share	9 Months Ended
	Sep. 30, 2018
Notes to Financial Statements
Earnings Per Share [Text Block]	Note 4 Basic net income per share is computed based on the weighted-average number of common shares outstanding. Diluted net income per share is computed based on the weighted-average number of common shares outstanding, increased by the number of additional shares that would have been outstanding had potentially dilutive common shares been issued and reduced by the number of shares the Company could have repurchased from the proceeds from issuance of the potentially dilutive shares. Potentially dilutive shares of common stock include stock options, restricted stock units and restricted stock awards granted under stock-based compensation plans and shares committed to be purchased under the employee stock purchase plan. Performance stock units are excluded from the calculation of dilutive potential common shares until the performance conditions have been satisfied. The table below sets forth the computation of basic and diluted net income per share: Three Months Ended Nine Months Ended September 30, September 30, (in thousands, except share and per share amounts) 2018 2017 2018 2017 Net income $ 20,937 $ 13,220 $ 57,302 $ 37,506 Basic - weighted-average shares outstanding: 27,038,585 26,617,349 26,963,205 26,600,174 Effect of dilutive securities: Employee stock options and other 299,301 184,685 305,106 116,379 Diluted - weighted-average shares outstanding: 27,337,886 26,802,034 27,268,311 26,716,553 Net income per share: Basic $ 0.77 $ 0.50 $ 2.13 $ 1.41 Diluted $ 0.77 $ 0.49 $ 2.10 $ 1.40

Note 5 - Goodwill and Other Int

Note 5 - Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2018
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	Note 5 There were no three September 30, 2018. nine September 30, 2018 (in thousands) Nine Months Ended September 30, 2018 Balance as of the beginning of the period $ 128,504 Goodwill acquired during the period 248 Balance as of the end of the period $ 128,752 The Company adjusted goodwill by $0.2 nine September 30, 2018 November 2017. Intangible Assets other than goodwill at September 30, 2018 December 31, 2017 September 30, 2018 December 31, 2017 Useful Weighted Average (in thousands) Gross Accumulated Amortization Net Gross Accumulated Amortization Net Life (in years) Useful Life Remaining (in years) Intangible Assets with finite lives: Marketing assets $ 930 $ (411 ) $ 519 $ 930 $ (341 ) $ 589 10.0 5.5 Non-compete agreement 270 (202 ) 68 270 (190 ) 80 2.0 - 5.0 4.3 Trade secrets 250 (221 ) 29 250 (183 ) 67 5.0 0.5 Trade names 1,080 (405 ) 675 1,080 - 1,080 2.0 1.3 Software technology 11,229 (694 ) 10,535 8,229 - 8,229 10.0 9.3 Customer relationships 10,070 (2,183 ) 7,887 10,070 (1,031 ) 9,039 6.0 - 9.0 5.1 Total intangible assets $ 23,829 $ (4,116 ) $ 19,713 $ 20,829 $ (1,745 ) $ 19,084 Amortization expense for intangible assets was $0.8 $0.1 three September 30, 2018 2017, $2.4 $0.4 nine September 30, 2018 2017, Estimated aggregated amortization expense based on the current carrying value of the amortizable intangible assets is as follows: (in thousands) Estimated Amortization Expense Remaining 2018 $ 843 2019 3,342 2020 2,786 2021 2,786 2022 2,786 Thereafter 7,170 Total estimated amortization expense $ 19,713

Note 6 - Fair Value Measurement

Note 6 - Fair Value Measurements	9 Months Ended
	Sep. 30, 2018
Notes to Financial Statements
Fair Value Disclosures [Text Block]	Note 6 ASC 820, Fair Value Measuremen 820 820 three may Level 1—Quoted Level 2—Observable 1 not Level 3—Unobservable no The Company’s cash consists of bank deposits. The Company’s cash equivalents measured at fair value consist of money market mutual funds. The Company determines the fair value of these investments using Level 1 The following table summarizes financial assets as of September 30, 2018 December 31, 2017 September 30, 2018 December 31, 2017 (in thousands) Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Financial Assets: Cash and cash equivalents Money market mutual fund $ 193 $ - $ - $ 3,034 $ - $ - Total $ 193 $ - $ - $ 3,034 $ - $ -

Note 7 - Marketable Securities

Note 7 - Marketable Securities	9 Months Ended
	Sep. 30, 2018
Notes to Financial Statements
Investment [Text Block]	Note 7 The Company invests in short-term and long-term agency, municipal, corporate, commercial paper and other debt securities. The securities are categorized as held-to-maturity and are recorded at amortized cost. Categorization as held-to-maturity is based on the Company’s ability and intent to hold these securities to maturity. The following table summarizes information regarding the Company’s short-term and long-term marketable securities as of September 30, 2018 December 31, 2017: September 30, 2018 (in thousands) Cost Unrealized Gains Unrealized Losses Fair Value U.S. municipal securities $ 20,607 $ - $ (74 ) $ 20,533 Corporate debt securities 43,525 - (153 ) 43,372 U.S. government agency securities 22,197 - (156 ) 22,041 Certificates of deposit/time deposits 4,456 - (29 ) 4,427 Total marketable securities $ 90,785 $ - $ (412 ) $ 90,373 December 31, 2017 (in thousands) Cost Unrealized Gains Unrealized Losses Fair Value U.S. municipal securities $ 28,364 $ - $ (104 ) $ 28,260 Corporate debt securities 29,806 - (128 ) 29,678 U.S. government agency securities 32,320 - (199 ) 32,121 Certificates of deposit/time deposits 3,968 - (32 ) 3,936 Total marketable securities $ 94,458 $ - $ (463 ) $ 93,995 Fair values for the corporate debt securities are primarily determined based on quoted market prices (Level 1 2 The Company tests for other-than-temporary losses on a quarterly basis and has considered the unrealized losses indicated above to be temporary in nature. In reaching this conclusion, the Company considered the credit quality of the issuers of the debt securities as well as the Company’s intent to hold the investments to maturity and recover the full principal. Classification of marketable securities as current or non-current is based upon the security’s maturity date as of the date of these financial statements. The September 30, 2018 may may September 30, (in thousands) 2018 Due in one year or less $ 57,561 Due after one year through five years 33,224 Total marketable securities $ 90,785

Note 8 - Inventory

Note 8 - Inventory	9 Months Ended
	Sep. 30, 2018
Notes to Financial Statements
Inventory Disclosure [Text Block]	Note 8 Inventory consists primarily of raw materials, which are recorded at the lower of cost or market using the average-cost method, which approximates first first The Company’s inventory consisted of the following as of the dates indicated: September 30, December 31, (in thousands) 2018 2017 Raw materials $ 9,424 $ 9,767 Work in process 532 1,998 Total inventory 9,956 11,765 Allowance for obsolescence (348 ) (494 ) Inventory, net of allowance $ 9,608 $ 11,271

Note 9 - Stock-based Compensati

Note 9 - Stock-based Compensation	9 Months Ended
	Sep. 30, 2018
Notes to Financial Statements
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	Note 9 Under the Company’s 2012 2012 2012 ten may 2012 may not Employee Stock Purchase Plan The Company’s 2012 15 six May 15 November 15, 85 first Stock-Based Compensation Expense Stock-based compensation expense was $3.0 $2.2 three September 30, 2018 2017, $8.0 $6.2 nine September 30, 2018 2017, Stock Options The following table summarizes stock option activity during the nine September 30, 2018: Weighted- Average Stock Options Exercise Price Options outstanding at December 31, 2017 399,397 $ 51.14 Granted 36,258 110.59 Exercised (152,110 ) 39.31 Forfeited (22,742 ) 70.00 Options outstanding at September 30, 2018 260,803 $ 64.66 Exercisable at September 30, 2018 126,008 $ 51.25 The outstanding options generally have a term of ten four five first first The weighted-average grant date fair value of options that were granted during the nine September 30, 2018 $50.08. The following table provides the assumptions used in the Black-Scholes pricing model valuation of options during the nine September 30, 2018 2017: Nine Months Ended September 30, 2018 2017 Risk-free interest rate 2.52 - 3.07% 2.24% Expected life (years) 6.25 6.50 Expected volatility 41.68 - 42.22% 44.68% Expected dividend yield 0% 0% As of September 30, 2018, $3.9 3.1 Restricted Stock Restricted stock awards are share-settled awards and restrictions lapse ratably over the vesting period, which is generally a period from four five first first The following table summarizes restricted stock activity during the nine September 30, 2018: Weighted- Average Grant Date Restricted Fair Value Stock Per Share Restricted stock at December 31, 2017 334,608 $ 63.29 Granted 106,760 115.41 Restrictions lapsed (83,456 ) 62.85 Forfeited (25,661 ) 65.73 Restricted stock at September 30, 2018 332,251 $ 79.96 As of September 30, 2018, $23.1 3.3 Performance Stock Performance stock units (PSUs) are expressed in terms of a target number of PSUs, with anywhere between 0 150 three The following table summarizes performance stock activity during the nine September 30, 2018: Weighted- Average Grant Date Performance Fair Value Stock Per Share Performance stock at December 31, 2017 25,707 $ 58.35 Granted 20,006 105.75 Restrictions lapsed - - Performance change 6,427 58.35 Forfeited - - Performance stock at September 30, 2018 52,140 $ 76.54 As of September 30, 2018, $2.5 2.0 Employee Stock Purchase Plan The following table presents the assumptions used to estimate the fair value of the ESPP during the nine September 30, 2018 2017: Nine Months Ended September 30, 2018 2017 Risk-free interest rate 1.48 - 2.06% 0.59 - 0.97% Expected life (months) 6.00 6.00 Expected volatility 24.49 - 31.50% 34.51 - 39.51% Expected dividend yield 0% 0%

Note 10 - Accumulated Other Com

Note 10 - Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 30, 2018
Notes to Financial Statements
Disclosure of Reclassification Amount [Text Block]	Note 10 Other comprehensive income (loss) is comprised entirely of foreign currency translation adjustments. The following table presents the changes in accumulated other comprehensive income (loss) balances during the three nine September 30, 2018 2017: Three Months Ended Nine Months Ended September 30, September 30, (in thousands) 2018 2017 2018 2017 Foreign currency translation adjustments Balance at beginning of period $ (6,359 ) $ (7,404 ) $ (5,234 ) $ (10,753 ) Other comprehensive income (loss) before reclassifications (879 ) 1,655 (2,004 ) 5,004 Amounts reclassified from accumulated other comprehensive loss - - - - Net current-period other comprehensive income (loss) (879 ) 1,655 (2,004 ) 5,004 Balance at end of period $ (7,238 ) $ (5,749 ) $ (7,238 ) $ (5,749 )

Note 11 - Income Taxes

Note 11 - Income Taxes	9 Months Ended
	Sep. 30, 2018
Notes to Financial Statements
Income Tax Disclosure [Text Block]	Note 11 The Company is subject to income tax in multiple jurisdictions and the use of estimates is required to determine the provision for income taxes. For the three September 30, 2018 2017, $4.5 $6.4 nine September 30, 2018 2017, $12.8 $17.7 three September 30, 2018 17.6 32.8 15.2 three September 30, 2018 2017 nine September 30, 2018 18.3 32.1 13.8 nine September 30, 2018 2017 The Tax Cuts and Jobs Act (the Act) was enacted on December 22, 2017. 35 21 2018 05, Income Taxes (Topic 740 ): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118, September 30, 2018, not no three nine September 30, 2018 10 December 31, 2017. 2018. The effective income tax rate for the three nine September 30, 2018 21.0 The Company had reserves against unrecognized tax benefits totaling $3.9 September 30, 2018 $4.2 December 31, 2017,

Note 12 - Segment Reporting

Note 12 - Segment Reporting	9 Months Ended
	Sep. 30, 2018
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	Note 12 The Company’s reportable segments are based on the internal reporting used by the Company’s Chief Executive Officer, who is the chief operating decision maker (CODM), to assess operating performance and make decisions about the allocation of resources. The Corporate Unallocated and Japan category includes non-reportable segments, as well as research and development and general and administrative costs that the Company does not Intercompany transactions primarily relate to intercontinental activity and have been eliminated and are excluded from the reported amounts. The difference between income from operations and pre-tax income relates to foreign currency-related gains and losses and interest income on cash balances and investments, which are not Revenue and income from operations by reportable segment for the three nine September 30, 2018 2017 Three Months Ended September 30, Nine Months Ended September 30, (in thousands) 2018 2017 2018 2017 Revenue: United States $ 90,732 $ 67,490 $ 261,253 $ 191,019 Europe 21,273 18,094 61,431 51,224 Japan 3,425 2,521 10,143 8,069 Total revenue $ 115,430 $ 88,105 $ 332,827 $ 250,312 Three Months Ended September 30, Nine Months Ended September 30, (in thousands) 2018 2017 2018 2017 Income from Operations: United States $ 31,726 $ 26,903 $ 92,258 $ 76,973 Europe 5,478 3,251 12,879 9,626 Corporate Unallocated and Japan (12,173 ) (10,787 ) (36,394 ) (33,148 ) Total Income from Operations $ 25,031 $ 19,367 $ 68,743 $ 53,451 Total long-lived assets at September 30, 2018 December 31, 2017 September 30, December 31, (in thousands) 2018 2017 Total long-lived assets: United States $ 168,903 $ 125,308 Europe 33,783 33,691 Japan 7,367 7,441 Total Assets $ 210,053 $ 166,440

Note 3 - Revenue (Tables)

Note 3 - Revenue (Tables)	9 Months Ended
	Sep. 30, 2018
Notes Tables
Disaggregation of Revenue [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, (in thousands) 2018 2017 2018 2017 Revenue: United States $ 90,732 $ 67,490 $ 261,253 $ 191,019 Europe 21,273 18,094 61,431 51,224 Japan 3,425 2,521 10,143 8,069 Total revenue $ 115,430 $ 88,105 $ 332,827 $ 250,312 Three Months Ended September 30, Nine Months Ended September 30, (in thousands) 2018 2017 2018 2017 Revenue: Injection Molding $ 53,681 $ 49,480 $ 156,610 $ 144,187 CNC Machining 40,845 27,166 115,364 73,318 3D Printing 13,845 11,102 39,418 32,061 Sheet Metal 6,452 - 19,002 - Other Revenue 607 357 2,433 746 Total revenue $ 115,430 $ 88,105 $ 332,827 $ 250,312

Note 4 - Net Income Per Commo_2

Note 4 - Net Income Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2018
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three Months Ended Nine Months Ended September 30, September 30, (in thousands, except share and per share amounts) 2018 2017 2018 2017 Net income $ 20,937 $ 13,220 $ 57,302 $ 37,506 Basic - weighted-average shares outstanding: 27,038,585 26,617,349 26,963,205 26,600,174 Effect of dilutive securities: Employee stock options and other 299,301 184,685 305,106 116,379 Diluted - weighted-average shares outstanding: 27,337,886 26,802,034 27,268,311 26,716,553 Net income per share: Basic $ 0.77 $ 0.50 $ 2.13 $ 1.41 Diluted $ 0.77 $ 0.49 $ 2.10 $ 1.40

Note 5 - Goodwill and Other I_2

Note 5 - Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2018
Notes Tables
Schedule of Goodwill [Table Text Block]	(in thousands) Nine Months Ended September 30, 2018 Balance as of the beginning of the period $ 128,504 Goodwill acquired during the period 248 Balance as of the end of the period $ 128,752
Schedule of Finite-Lived Intangible Assets [Table Text Block]	September 30, 2018 December 31, 2017 Useful Weighted Average (in thousands) Gross Accumulated Amortization Net Gross Accumulated Amortization Net Life (in years) Useful Life Remaining (in years) Intangible Assets with finite lives: Marketing assets $ 930 $ (411 ) $ 519 $ 930 $ (341 ) $ 589 10.0 5.5 Non-compete agreement 270 (202 ) 68 270 (190 ) 80 2.0 - 5.0 4.3 Trade secrets 250 (221 ) 29 250 (183 ) 67 5.0 0.5 Trade names 1,080 (405 ) 675 1,080 - 1,080 2.0 1.3 Software technology 11,229 (694 ) 10,535 8,229 - 8,229 10.0 9.3 Customer relationships 10,070 (2,183 ) 7,887 10,070 (1,031 ) 9,039 6.0 - 9.0 5.1 Total intangible assets $ 23,829 $ (4,116 ) $ 19,713 $ 20,829 $ (1,745 ) $ 19,084
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	(in thousands) Estimated Amortization Expense Remaining 2018 $ 843 2019 3,342 2020 2,786 2021 2,786 2022 2,786 Thereafter 7,170 Total estimated amortization expense $ 19,713

Note 6 - Fair Value Measureme_2

Note 6 - Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2018
Notes Tables
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	September 30, 2018 December 31, 2017 (in thousands) Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Financial Assets: Cash and cash equivalents Money market mutual fund $ 193 $ - $ - $ 3,034 $ - $ - Total $ 193 $ - $ - $ 3,034 $ - $ -

Note 7 - Marketable Securities

Note 7 - Marketable Securities (Tables)	9 Months Ended
	Sep. 30, 2018
Notes Tables
Debt Securities, Held-to-maturity [Table Text Block]	September 30, 2018 (in thousands) Cost Unrealized Gains Unrealized Losses Fair Value U.S. municipal securities $ 20,607 $ - $ (74 ) $ 20,533 Corporate debt securities 43,525 - (153 ) 43,372 U.S. government agency securities 22,197 - (156 ) 22,041 Certificates of deposit/time deposits 4,456 - (29 ) 4,427 Total marketable securities $ 90,785 $ - $ (412 ) $ 90,373 December 31, 2017 (in thousands) Cost Unrealized Gains Unrealized Losses Fair Value U.S. municipal securities $ 28,364 $ - $ (104 ) $ 28,260 Corporate debt securities 29,806 - (128 ) 29,678 U.S. government agency securities 32,320 - (199 ) 32,121 Certificates of deposit/time deposits 3,968 - (32 ) 3,936 Total marketable securities $ 94,458 $ - $ (463 ) $ 93,995
Investments Classified by Contractual Maturity Date [Table Text Block]	September 30, (in thousands) 2018 Due in one year or less $ 57,561 Due after one year through five years 33,224 Total marketable securities $ 90,785

Note 8 - Inventory (Tables)

Note 8 - Inventory (Tables)	9 Months Ended
	Sep. 30, 2018
Notes Tables
Schedule of Inventory, Current [Table Text Block]	September 30, December 31, (in thousands) 2018 2017 Raw materials $ 9,424 $ 9,767 Work in process 532 1,998 Total inventory 9,956 11,765 Allowance for obsolescence (348 ) (494 ) Inventory, net of allowance $ 9,608 $ 11,271

Note 9 - Stock-based Compensa_2

Note 9 - Stock-based Compensation (Tables)	9 Months Ended
	Sep. 30, 2018
Notes Tables
Share-based Compensation, Stock Options, Activity [Table Text Block]	Weighted- Average Stock Options Exercise Price Options outstanding at December 31, 2017 399,397 $ 51.14 Granted 36,258 110.59 Exercised (152,110 ) 39.31 Forfeited (22,742 ) 70.00 Options outstanding at September 30, 2018 260,803 $ 64.66 Exercisable at September 30, 2018 126,008 $ 51.25
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Nine Months Ended September 30, 2018 2017 Risk-free interest rate 2.52 - 3.07% 2.24% Expected life (years) 6.25 6.50 Expected volatility 41.68 - 42.22% 44.68% Expected dividend yield 0% 0%
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]	Weighted- Average Grant Date Restricted Fair Value Stock Per Share Restricted stock at December 31, 2017 334,608 $ 63.29 Granted 106,760 115.41 Restrictions lapsed (83,456 ) 62.85 Forfeited (25,661 ) 65.73 Restricted stock at September 30, 2018 332,251 $ 79.96
Schedule of Nonvested Performance-based Units Activity [Table Text Block]	Weighted- Average Grant Date Performance Fair Value Stock Per Share Performance stock at December 31, 2017 25,707 $ 58.35 Granted 20,006 105.75 Restrictions lapsed - - Performance change 6,427 58.35 Forfeited - - Performance stock at September 30, 2018 52,140 $ 76.54
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]	Nine Months Ended September 30, 2018 2017 Risk-free interest rate 1.48 - 2.06% 0.59 - 0.97% Expected life (months) 6.00 6.00 Expected volatility 24.49 - 31.50% 34.51 - 39.51% Expected dividend yield 0% 0%

Note 10 - Accumulated Other C_2

Note 10 - Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2018
Notes Tables
Comprehensive Income (Loss) [Table Text Block]	Three Months Ended Nine Months Ended September 30, September 30, (in thousands) 2018 2017 2018 2017 Foreign currency translation adjustments Balance at beginning of period $ (6,359 ) $ (7,404 ) $ (5,234 ) $ (10,753 ) Other comprehensive income (loss) before reclassifications (879 ) 1,655 (2,004 ) 5,004 Amounts reclassified from accumulated other comprehensive loss - - - - Net current-period other comprehensive income (loss) (879 ) 1,655 (2,004 ) 5,004 Balance at end of period $ (7,238 ) $ (5,749 ) $ (7,238 ) $ (5,749 )

Note 12 - Segment Reporting (Ta

Note 12 - Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2018
Notes Tables
Income from Operations by Geographic Area [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, (in thousands) 2018 2017 2018 2017 Income from Operations: United States $ 31,726 $ 26,903 $ 92,258 $ 76,973 Europe 5,478 3,251 12,879 9,626 Corporate Unallocated and Japan (12,173 ) (10,787 ) (36,394 ) (33,148 ) Total Income from Operations $ 25,031 $ 19,367 $ 68,743 $ 53,451
Long-lived Assets by Geographic Areas [Table Text Block]	September 30, December 31, (in thousands) 2018 2017 Total long-lived assets: United States $ 168,903 $ 125,308 Europe 33,783 33,691 Japan 7,367 7,441 Total Assets $ 210,053 $ 166,440
Operating Segments [Member]
Notes Tables
Revenue from External Customers by Geographic Areas [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, (in thousands) 2018 2017 2018 2017 Revenue: United States $ 90,732 $ 67,490 $ 261,253 $ 191,019 Europe 21,273 18,094 61,431 51,224 Japan 3,425 2,521 10,143 8,069 Total revenue $ 115,430 $ 88,105 $ 332,827 $ 250,312

Note 2 - Recent Accounting Pr_2

Note 2 - Recent Accounting Pronouncements (Details Textual) $ in Millions	Jan. 01, 2018USD ($)
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 1.5

Note 3 - Revenue (Details Textu

Note 3 - Revenue (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018
Revenue from Contract with Customer, Including Assessed Tax	$ 115,430	$ 88,105	$ 332,827	$ 250,312
Cost of Goods and Services Sold, Total	53,027	$ 38,793	153,303	109,358
Increase (Decrease) in Accounts Receivable			8,993	10,679
Increase (Decrease) in Inventories, Total			(324)	$ 188
Accounting Standards Update 2014-09 [Member]
Revenue from Contract with Customer, Including Assessed Tax	1,300		1,500
Cost of Goods and Services Sold, Total	600		700
Increase (Decrease) in Accounts Receivable	1,300		4,000
Increase (Decrease) in Inventories, Total	$ (600)		$ 1,800
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption					$ 1,500

Note 3 - Revenue - Summary of R

Note 3 - Revenue - Summary of Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue	$ 115,430	$ 88,105	$ 332,827	$ 250,312
Injection Molding (Protomold) [Member]
Revenue	53,681	49,480	156,610	144,187
CNC Machining (Firstcut) [Member]
Revenue	40,845	27,166	115,364	73,318
3D Printing (Fineline) [Member]
Revenue	13,845	11,102	39,418	32,061
Sheet Metal [Member]
Revenue	6,452		19,002
Other Products [Member]
Revenue	607	357	2,433	746
UNITED STATES
Revenue	90,732	67,490	261,253	191,019
Europe [Member]
Revenue	21,273	18,094	61,431	51,224
JAPAN
Revenue	$ 3,425	$ 2,521	$ 10,143	$ 8,069

Note 4 - Net Income Per Commo_3

Note 4 - Net Income Per Common Share - Computation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income	$ 20,937	$ 13,220	$ 57,302	$ 37,506
Basic - weighted-average shares outstanding: (in shares)	27,038,585	26,617,349	26,963,205	26,600,174
Employee stock options and other (in shares)	299,301	184,685	305,106	116,379
Diluted - weighted-average shares outstanding: (in shares)	27,337,886	26,802,034	27,268,311	26,716,553
Basic (in dollars per share)	$ 0.77	$ 0.50	$ 2.13	$ 1.41
Diluted (in dollars per share)	$ 0.77	$ 0.49	$ 2.10	$ 1.40

Note 5 - Goodwill and Other I_3

Note 5 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Goodwill, Acquired During Period			$ 248
Amortization of Intangible Assets, Total	$ 800	$ 100	2,400	$ 400
Rapid [Member]
Goodwill, Acquired During Period			$ 200

Note 5 - Goodwill and Other I_4

Note 5 - Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)
Balance as of the beginning of the period	$ 128,504
Goodwill acquired during the period	248
Balance as of the end of the period	$ 128,752

Note 5 - Goodwill and Other I_5

Note 5 - Goodwill and Other Intangible Assets - Intangible Assets Other Than Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Gross	$ 23,829	$ 20,829
Accumulated amortization	(4,116)	(1,745)
Net	19,713	19,084
Marketing-Related Intangible Assets [Member]
Gross	930	930
Accumulated amortization	(411)	(341)
Net	$ 519	589
Useful life (Year)	10 years
Weighted average useful life remaining (Year)	5 years 182 days
Noncompete Agreements [Member]
Gross	$ 270	270
Accumulated amortization	(202)	(190)
Net	$ 68	80
Weighted average useful life remaining (Year)	4 years 109 days
Noncompete Agreements [Member] | Minimum [Member]
Useful life (Year)	2 years
Noncompete Agreements [Member] | Maximum [Member]
Useful life (Year)	5 years
Trade Secrets [Member]
Gross	$ 250	250
Accumulated amortization	(221)	(183)
Net	$ 29	67
Useful life (Year)	5 years
Weighted average useful life remaining (Year)	182 days
Trade Names [Member]
Gross	$ 1,080	1,080
Accumulated amortization	(405)
Net	$ 675	1,080
Useful life (Year)	2 years
Weighted average useful life remaining (Year)	1 year 109 days
Computer Software, Intangible Asset [Member]
Gross	$ 11,229	8,229
Accumulated amortization	(694)
Net	$ 10,535	8,229
Useful life (Year)	10 years
Weighted average useful life remaining (Year)	9 years 109 days
Customer Relationships [Member]
Gross	$ 10,070	10,070
Accumulated amortization	(2,183)	(1,031)
Net	$ 7,887	$ 9,039
Weighted average useful life remaining (Year)	5 years 36 days
Customer Relationships [Member] | Minimum [Member]
Useful life (Year)	6 years
Customer Relationships [Member] | Maximum [Member]
Useful life (Year)	9 years

Note 5 - Goodwill and Other I_6

Note 5 - Goodwill and Other Intangible Assets - Estimated Aggregated Amortization Expense (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Remaining 2,018	$ 843
2,019	3,342
2,020	2,786
2,021	2,786
2,022	2,786
Thereafter	7,170
Total estimated amortization expense	$ 19,713	$ 19,084

Note 6 - Fair Value Measureme_3

Note 6 - Fair Value Measurements - Fair Value of Financial Assets Measured on a Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Inputs, Level 1 [Member]
Money market mutual fund	$ 193	$ 3,034
Total	193	3,034
Fair Value, Inputs, Level 2 [Member]
Money market mutual fund
Total
Fair Value, Inputs, Level 3 [Member]
Money market mutual fund
Total

Note 7 - Marketable Securitie_2

Note 7 - Marketable Securities - Short-term and Long-term Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Amortized Cost	$ 90,785	$ 94,458
Unrealized Gains
Unrealized Losses	(412)	(463)
Fair Value	90,373	93,995
Bank Time Deposits [Member]
Amortized Cost	4,456	3,968
Unrealized Gains
Unrealized Losses	(29)	(32)
Fair Value	4,427	3,936
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	20,607	28,364
Unrealized Gains
Unrealized Losses	(74)	(104)
Fair Value	20,533	28,260
Corporate Debt Securities [Member]
Amortized Cost	43,525	29,806
Unrealized Gains
Unrealized Losses	(153)	(128)
Fair Value	43,372	29,678
US Government Agencies Debt Securities [Member]
Amortized Cost	22,197	32,320
Unrealized Gains
Unrealized Losses	(156)	(199)
Fair Value	$ 22,041	$ 32,121

Note 7 - Marketable Securitie_3

Note 7 - Marketable Securities - Balance of Held-to-maturity Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Due in one year or less	$ 57,561
Due after one year through five years	33,224
Total marketable securities	$ 90,785	$ 94,458

Note 8 - Inventory - Inventory

Note 8 - Inventory - Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Raw materials	$ 9,424	$ 9,767
Work in process	532	1,998
Total inventory	9,956	11,765
Allowance for obsolescence	(348)	(494)
Inventory, net of allowance	$ 9,608	$ 11,271

Note 9 - Stock-based Compensa_3

Note 9 - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			10 years
Share-based Compensation, Total	$ 3,000	$ 2,200	$ 7,986	$ 6,159
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 50.08
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total	3,900		$ 3,900
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date			15.00%
Employee Stock Purchase Plan, Offering Period			180 days
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent			85.00%
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			10 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			3 years 36 days
Employee Stock Option [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4 years
Employee Stock Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			5 years
Restricted Stock [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total	23,100		$ 23,100
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			3 years 109 days
Restricted Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4 years
Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			5 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total	$ 2,500		$ 2,500
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years
Percentage of Target Number Capable of Being Earned and Vesting, Lower Limit	0.00%		0.00%
Percentage of Target Number Capable of Being Earned and Vesting, Upper Limit	150.00%		150.00%

Note 9 - Stock-based Compensa_4

Note 9 - Stock-based Compensation - Stock Option Activity (Details)	9 Months Ended
	Sep. 30, 2018$ / sharesshares
Options outstanding (in shares) | shares	399,397
Options outstanding, weighted- average exercise price (in dollars per share) | $ / shares	$ 51.14
Granted (in shares) | shares	36,258
Granted, weighted- average exercise price (in dollars per share) | $ / shares	$ 110.59
Exercised (in shares) | shares	(152,110)
Exercised, weighted- average exercise price (in dollars per share) | $ / shares	$ 39.31
Forfeited (in shares) | shares	(22,742)
Forfeited, weighted- average exercise price (in dollars per share) | $ / shares	$ 70
Options outstanding (in shares) | shares	260,803
Options outstanding, weighted- average exercise price (in dollars per share) | $ / shares	$ 64.66
Options exercisable (in shares) | shares	126,008
Options exercisable, weighted- average exercise price (in dollars per share) | $ / shares	$ 51.25

Note 9 - Stock-based Compensa_5

Note 9 - Stock-based Compensation - Assumptions Used in the Black-Scholes Option Pricing Model (Details) - Employee Stock Option [Member]	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Risk-free interest rate		2.24%
Expected life (Year)	6 years 91 days	6 years 182 days
Expected volatility		44.68%
Expected dividend yield	0.00%	0.00%
Minimum [Member]
Risk-free interest rate	2.52%
Expected volatility	41.68%
Maximum [Member]
Risk-free interest rate	3.07%
Expected volatility	42.22%

Note 9 - Stock-based Compensa_6

Note 9 - Stock-based Compensation - Non-vested Restricted Stock Options (Details) - Restricted Stock [Member]	9 Months Ended
	Sep. 30, 2018$ / sharesshares
Restricted stock (in shares) | shares	334,608
Restricted stock, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 63.29
Granted (in shares) | shares	106,760
Granted, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 115.41
Restrictions lapsed (in shares) | shares	(83,456)
Restrictions lapsed, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 62.85
Forfeited (in shares) | shares	(25,661)
Forfeited, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 65.73
Restricted stock (in shares) | shares	332,251
Restricted stock, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 79.96

Note 9 - Stock-based Compensa_7

Note 9 - Stock-based Compensation - Performance Stock (Details) - Performance Shares [Member]	9 Months Ended
	Sep. 30, 2018$ / sharesshares
Restricted stock (in shares) | shares	25,707
Restricted stock, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 58.35
Granted (in shares) | shares	20,006
Granted, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 105.75
Restrictions lapsed (in shares) | shares
Restrictions lapsed, weighted-average grant date fair value (in dollars per share) | $ / shares
Performance change (in shares) | shares	6,427
Performance change, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 58.35
Forfeited (in shares) | shares
Forfeited, weighted-average grant date fair value (in dollars per share) | $ / shares
Restricted stock (in shares) | shares	52,140
Restricted stock, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 76.54

Note 9 - Stock-based Compensa_8

Note 9 - Stock-based Compensation - Assumptions Used to Estimate the Fair Value of the ESPP (Details) - ESPP [Member]	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Expected life (Month)	180 days	180 days
Expected dividend yield	0.00%	0.00%
Minimum [Member]
Risk-free interest rate	1.48%	0.59%
Expected volatility	24.49%	34.51%
Maximum [Member]
Risk-free interest rate	2.06%	0.97%
Expected volatility	31.50%	39.51%

Note 10 - Accumulated Other C_3

Note 10 - Accumulated Other Comprehensive Loss - Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Balance beginning of period			$ 461,215
Balance at end of period	$ 531,206		531,206
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance beginning of period	(6,359)	$ (7,404)	(5,234)	$ (10,753)
Other comprehensive income (loss) before reclassifications	(879)	1,655	(2,004)	5,004
Amounts reclassified from accumulated other comprehensive loss
Net current-period other comprehensive income (loss)	(879)	1,655	(2,004)	5,004
Balance at end of period	$ (7,238)	$ (5,749)	$ (7,238)	$ (5,749)

Note 11 - Income Taxes (Details

Note 11 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Expense (Benefit), Total	$ 4,484	$ 6,438	$ 12,817	$ 17,724
Effective Income Tax Rate Reconciliation, Percent, Total	17.60%	32.80%	18.30%	32.10%
Effective Income Tax Rate, Increase (Decrease), Percentage	(15.20%)		(13.80%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%		21.00%
Unrecognized Tax Benefits, Ending Balance	$ 3,900		$ 3,900		$ 4,200

Note 12 - Segment Reporting - R

Note 12 - Segment Reporting - Revenue from Operations by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue	$ 115,430	$ 88,105	$ 332,827	$ 250,312
Operating Segments [Member] | United States Segment [Member]
Revenue	90,732	67,490	261,253	191,019
Operating Segments [Member] | Europe Segment [Member]
Revenue	21,273	18,094	61,431	51,224
Operating Segments [Member] | Japan Segment [Member]
Revenue	$ 3,425	$ 2,521	$ 10,143	$ 8,069

Note 12 - Segment Reporting - I

Note 12 - Segment Reporting - Income From Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income from operations	$ 25,031	$ 19,367	$ 68,743	$ 53,451
Operating Segments [Member] | United States Segment [Member]
Income from operations	31,726	26,903	92,258	76,973
Operating Segments [Member] | Europe Segment [Member]
Income from operations	5,478	3,251	12,879	9,626
Corporate and Reconciling Items [Member] | Corporate Unallocated and Japan Segment[Member]
Income from operations	$ (12,173)	$ (10,787)	$ (36,394)	$ (33,148)

Note 12 - Segment Reporting - L

Note 12 - Segment Reporting - Long-lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Long-lived assets	$ 210,053	$ 166,440
Operating Segments [Member] | United States Segment [Member]
Long-lived assets	168,903	125,308
Operating Segments [Member] | Europe Segment [Member]
Long-lived assets	33,783	33,691
Operating Segments [Member] | Japan Segment [Member]
Long-lived assets	$ 7,367	$ 7,441