Proto Labs (PRLB) 10-Q 1 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	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 Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Entity Common Stock, Shares Outstanding (in shares)		27,027,044
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

Consolidated Balance Sheets (Cu

Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 62,605	$ 36,707
Short-term marketable securities	57,619	57,424
Accounts receivable, net of allowance for doubtful accounts of $982 and $757 as of June 30, 2018 and December 31, 2017, respectively	55,928	51,503
Inventory	9,590	11,271
Prepaid expenses and other current assets	7,678	6,267
Income taxes receivable		1,832
Total current assets	193,420	165,004
Property and equipment, net	197,339	166,440
Goodwill	128,752	128,504
Other intangible assets, net	18,521	19,084
Long-term marketable securities	24,636	37,034
Other long-term assets	3,519	2,672
Total assets	566,187	518,738
Liabilities and shareholders' equity
Accounts payable	20,038	15,876
Accrued compensation	13,822	12,100
Accrued liabilities and other	9,885	8,408
Short-term debt obligations		5,000
Income taxes payable	637	2,371
Total current liabilities	44,382	43,755
Long-term income taxes payable	2,181	2,181
Long-term deferred tax liabilities	8,583	6,966
Other long-term liabilities	4,788	4,621
Total liabilities	59,934	57,523
Shareholders' equity
Preferred stock, $0.001 par value, authorized 10,000,000 shares; issued and outstanding 0 shares as of each of June 30, 2018 and December 31, 2017
Common stock, $0.001 par value, authorized 150,000,000 shares; issued and outstanding 27,026,394 and 26,828,651 shares as of June 30, 2018 and December 31, 2017, respectively	27	27
Additional paid-in capital	250,063	241,725
Retained earnings	262,522	224,697
Accumulated other comprehensive loss	(6,359)	(5,234)
Total shareholders' equity	506,253	461,215
Total liabilities and shareholders' equity	$ 566,187	$ 518,738

Consolidated Balance Sheets (C3

Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Allowance for doubtful accounts	$ 982	$ 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)	27,026,394	26,828,651
Common stock, shares outstanding (in shares)	27,026,394	26,828,651

Consolidated Statements of Comp

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
Statements of Operations:
Revenue	$ 109,652	$ 82,040	$ 217,397	$ 162,207
Cost of revenue	50,439	35,671	100,276	70,565
Gross profit	59,213	46,369	117,121	91,642
Operating expenses
Marketing and sales	17,557	14,630	34,129	27,617
Research and development	7,032	6,084	13,697	11,907
General and administrative	12,640	9,253	25,583	18,034
Total operating expenses	37,229	29,967	73,409	57,558
Income from operations	21,984	16,402	43,712	34,084
Other income, net	808	1,173	986	1,488
Income before income taxes	22,792	17,575	44,698	35,572
Provision for income taxes	4,478	5,489	8,333	11,286
Net income	$ 18,314	$ 12,086	$ 36,365	$ 24,286
Net income per share:
Basic (in dollars per share)	$ 0.68	$ 0.46	$ 1.35	$ 0.91
Diluted (in dollars per share)	$ 0.67	$ 0.45	$ 1.34	$ 0.91
Shares used to compute net income per share:
Basic (in shares)	26,972,990	26,541,978	26,925,673	26,554,262
Diluted (in shares)	27,274,882	26,649,152	27,232,215	26,710,217
Comprehensive Income (net of tax)
Comprehensive income	$ 14,796	$ 14,250	$ 35,240	$ 27,635

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities
Net income	$ 36,365	$ 24,286
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,749	8,700
Stock-based compensation expense	5,034	3,958
Deferred taxes	1,620	1,608
Gain on sale of businesses	(671)
Amortization of held-to-maturity securities	276	592
Other	7	77
Changes in operating assets and liabilities:
Accounts receivable	(2,648)	(6,914)
Inventories	389	175
Prepaid expenses and other	(1,059)	(775)
Income taxes	133	1,769
Accounts payable	4,408	2,534
Accrued liabilities and other	2,714	3,417
Net cash provided by operating activities	59,317	39,427
Investing activities
Purchases of property and equipment	(43,194)	(13,301)
Cash used for acquisitions, net of cash acquired	(90)
Proceeds from sale of businesses	284
Purchases of marketable securities	(17,129)	(20,037)
Proceeds from maturities of marketable securities	29,056	25,194
Purchases of other assets and investments		(514)
Net cash used in investing activities	(31,073)	(8,658)
Financing activities
Payments on debt	(5,000)
Proceeds from exercises of stock options and other	3,306	3,791
Repurchases of common stock		(4,410)
Net cash used in financing activities	(1,694)	(619)
Effect of exchange rate changes on cash and cash equivalents	(652)	251
Net increase in cash and cash equivalents	25,898	30,401
Cash and cash equivalents, beginning of period	36,707	68,795
Cash and cash equivalents, end of period	$ 62,605	$ 99,196

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]	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	6 Months Ended
	Jun. 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 not In January 2017, 2017 04, Intangibles – Goodwill and Other, December 15, 2019 not

Note 3 - Revenue

Note 3 - Revenue	6 Months Ended
	Jun. 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 prototyping and on-demand manufacturing services at unprecedented speeds. 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 $0.2 $0.1 three June 30, 2018, $0.2 $0.1 June 30, 2018. six June 30, 2018 606 $0.1 $0.1 $2.7 $1.2 June 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 six June 30, 2018 2017 Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2018 2017 2018 2017 Revenue: United States $ 86,354 $ 63,353 $ 170,521 $ 123,529 Europe 20,213 16,131 40,158 33,130 Japan 3,085 2,556 6,718 5,548 Total revenue $ 109,652 $ 82,040 $ 217,397 $ 162,207 Revenue by product line for the three six June 30, 2018 2017 Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2018 2017 2018 2017 Revenue: Injection Molding $ 51,586 $ 46,792 $ 102,929 $ 94,708 CNC Machining 37,788 24,180 74,519 46,152 3D Printing 13,248 10,873 25,573 20,958 Sheet Metal 6,309 - 12,550 - Other Revenue 721 195 1,826 389 Total revenue $ 109,652 $ 82,040 $ 217,397 $ 162,207 The Company generally expenses sales commissions when incurred because the amortization period would have been one not one

Note 4 - Net Income Per Common

Note 4 - Net Income Per Common Share	6 Months Ended
	Jun. 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 Six Months Ended June 30, June 30, (in thousands, except share and per share amounts) 2018 2017 2018 2017 Net income $ 18,314 $ 12,086 $ 36,365 $ 24,286 Basic - weighted-average shares outstanding: 26,972,990 26,541,978 26,925,673 26,554,262 Effect of dilutive securities: Employee stock options and other 301,892 107,174 306,542 155,955 Diluted - weighted-average shares outstanding: 27,274,882 26,649,152 27,232,215 26,710,217 Net income per share: Basic $ 0.68 $ 0.46 $ 1.35 $ 0.91 Diluted $ 0.67 $ 0.45 $ 1.34 $ 0.91

Note 5 - Goodwill and Other Int

Note 5 - Goodwill and Other Intangible Assets	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	Note 5 There were no three June 30, 2018. six June 30, 2018 (in thousands) Six Months Ended June 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 six June 30, 2018 November 2017. Intangible Assets other than goodwill at June 30, 2018 December 31, 2017 June 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 $ (387 ) $ 543 $ 930 $ (341 ) $ 589 10.0 5.8 Non-compete agreement 270 (198 ) 72 270 (190 ) 80 2.0 - 5.0 4.5 Trade secrets 250 (208 ) 42 250 (183 ) 67 5.0 0.8 Trade names 1,080 (270 ) 810 1,080 - 1,080 2.0 1.5 Software technology 9,229 (445 ) 8,784 8,229 - 8,229 10.0 9.5 Customer relationships 10,070 (1,800 ) 8,270 10,070 (1,031 ) 9,039 6.0 - 9.0 5.3 Total intangible assets $ 21,829 $ (3,308 ) $ 18,521 $ 20,829 $ (1,745 ) $ 19,084 Amortization expense for intangible assets was $0.8 $0.1 three June 30, 2018 2017, $1.6 $0.3 six June 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 $ 1,581 2019 3,128 2020 2,571 2021 2,571 2022 2,571 Thereafter 6,099 Total estimated amortization expense $ 18,521

Note 6 - Fair Value Measurement

Note 6 - Fair Value Measurements	6 Months Ended
	Jun. 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 June 30, 2018 December 31, 2017 June 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 $ 8,366 $ - $ - $ 3,034 $ - $ - Total $ 8,366 $ - $ - $ 3,034 $ - $ -

Note 7 - Marketable Securities

Note 7 - Marketable Securities	6 Months Ended
	Jun. 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 June 30, 2018 December 31, 2017: June 30, 2018 (in thousands) Cost Unrealized Gains Unrealized Losses Fair Value U.S. municipal securities $ 18,013 $ - $ (58 ) $ 17,955 Corporate debt securities 34,346 - (157 ) 34,189 U.S. government agency securities 24,674 - (178 ) 24,496 Certificates of deposit/time deposits 3,968 - (38 ) 3,930 Commercial paper 1,254 - (0 ) 1,254 Total marketable securities $ 82,255 $ - $ (431 ) $ 81,824 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 June 30, 2018 may may June 30, (in thousands) 2018 Due in one year or less $ 57,619 Due after one year through five years 24,636 Total marketable securities $ 82,255

Note 8 - Inventory

Note 8 - Inventory	6 Months Ended
	Jun. 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: June 30, December 31, (in thousands) 2018 2017 Raw materials $ 9,382 $ 9,767 Work in process 712 1,998 Total inventory 10,094 11,765 Allowance for obsolescence (504 ) (494 ) Inventory, net of allowance $ 9,590 $ 11,271

Note 9 - Stock-based Compensati

Note 9 - Stock-based Compensation	6 Months Ended
	Jun. 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 $2.7 $2.2 three June 30, 2018 2017, $5.0 $4.0 six June 30, 2018 2017, Stock Options The following table summarizes stock option activity during the six June 30, 2018: Weighted- Average Stock Options Exercise Price Options outstanding at December 31, 2017 399,397 $ 51.14 Granted 34,386 109.91 Exercised (108,941 ) 37.04 Forfeited (17,077 ) 61.30 Options outstanding at June 30, 2018 307,765 $ 62.14 Exercisable at June 30, 2018 168,243 $ 49.52 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 six June 30, 2018 $49.76. The following table provides the assumptions used in the Black-Scholes pricing model valuation of options during the six June 30, 2018 2017: Six Months Ended June 30, 2018 2017 Risk-free interest rate 2.52 - 3.07% 2.24% Expected life (years) 6.25 6.50 Expected volatility 41.95 - 42.22% 44.68% Expected dividend yield 0% 0% As of June 30, 2018, $4.4 3.3 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 six June 30, 2018: Weighted- Average Grant Date Restricted Fair Value Stock Per Share Restricted stock at December 31, 2017 334,608 $ 63.29 Granted 103,818 115.20 Restrictions lapsed (83,390 ) 62.84 Forfeited (21,969 ) 62.28 Restricted stock at June 30, 2018 333,067 $ 79.64 As of June 30, 2018, $25.1 3.5 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 six June 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 June 30, 2018 52,140 $ 76.54 As of June 30, 2018, $2.9 2.3 Employee Stock Purchase Plan The following table presents the assumptions used to estimate the fair value of the ESPP during the six June 30, 2018 2017: Six Months Ended June 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	6 Months Ended
	Jun. 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 six June 30, 2018 2017: Three Months Ended Six Months Ended June 30, June 30, (in thousands) 2018 2017 2018 2017 Foreign currency translation adjustments Balance at beginning of period $ (2,841 ) $ (9,568 ) $ (5,234 ) $ (10,753 ) Other comprehensive income (loss) before reclassifications (3,518 ) 2,164 (1,125 ) 3,349 Amounts reclassified from accumulated other comprehensive loss - - - - Net current-period other comprehensive income (loss) (3,518 ) 2,164 (1,125 ) 3,349 Balance at end of period $ (6,359 ) $ (7,404 ) $ (6,359 ) $ (7,404 )

Note 11 - Income Taxes

Note 11 - Income Taxes	6 Months Ended
	Jun. 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 June 30, 2018 2017, $4.5 $5.5 six June 30, 2018 2017, $8.3 $11.3 three June 30, 2018 19.6 31.2 11.6 three June 30, 2018 2017 six June 30, 2018 18.6 31.7 13.1 six June 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, June 30, 2018, not no three six June 30, 2018 10 December 31, 2017. 2018. The effective income tax rate for the three six June 30, 2018 21.0 The Company had reserves against unrecognized tax benefits totaling $4.4 June 30, 2018 $4.2 December 31, 2017,

Note 12 - Segment Reporting

Note 12 - Segment Reporting	6 Months Ended
	Jun. 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 six June 30, 2018 2017 Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2018 2017 2018 2017 Revenue: United States $ 86,354 $ 63,353 $ 170,521 $ 123,529 Europe 20,213 16,131 40,158 33,130 Japan 3,085 2,556 6,718 5,548 Total revenue $ 109,652 $ 82,040 $ 217,397 $ 162,207 Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2018 2017 2018 2017 Income from Operations: United States $ 30,459 $ 25,723 $ 60,532 $ 50,069 Europe 4,022 2,335 7,401 6,375 Corporate Unallocated and Japan (12,497 ) (11,656 ) (24,221 ) (22,360 ) Total Income from Operations $ 21,984 $ 16,402 $ 43,712 $ 34,084 Total long-lived assets at June 30, 2018 December 31, 2017 June 30, December 31, (in thousands) 2018 2017 Total long-lived assets: United States $ 156,831 $ 125,308 Europe 33,194 33,691 Japan 7,314 7,441 Total Assets $ 197,339 $ 166,440

Significant Accounting Policies

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	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 not In January 2017, 2017 04, Intangibles – Goodwill and Other, December 15, 2019 not

Note 3 - Revenue (Tables)

Note 3 - Revenue (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, (in thousands) 2018 2017 2018 2017 Revenue: United States $ 86,354 $ 63,353 $ 170,521 $ 123,529 Europe 20,213 16,131 40,158 33,130 Japan 3,085 2,556 6,718 5,548 Total revenue $ 109,652 $ 82,040 $ 217,397 $ 162,207 Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2018 2017 2018 2017 Revenue: Injection Molding $ 51,586 $ 46,792 $ 102,929 $ 94,708 CNC Machining 37,788 24,180 74,519 46,152 3D Printing 13,248 10,873 25,573 20,958 Sheet Metal 6,309 - 12,550 - Other Revenue 721 195 1,826 389 Total revenue $ 109,652 $ 82,040 $ 217,397 $ 162,207

Note 4 - Net Income Per Commo20

Note 4 - Net Income Per Common Share (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three Months Ended Six Months Ended June 30, June 30, (in thousands, except share and per share amounts) 2018 2017 2018 2017 Net income $ 18,314 $ 12,086 $ 36,365 $ 24,286 Basic - weighted-average shares outstanding: 26,972,990 26,541,978 26,925,673 26,554,262 Effect of dilutive securities: Employee stock options and other 301,892 107,174 306,542 155,955 Diluted - weighted-average shares outstanding: 27,274,882 26,649,152 27,232,215 26,710,217 Net income per share: Basic $ 0.68 $ 0.46 $ 1.35 $ 0.91 Diluted $ 0.67 $ 0.45 $ 1.34 $ 0.91

Note 5 - Goodwill and Other I21

Note 5 - Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Schedule of Goodwill [Table Text Block]	(in thousands) Six Months Ended June 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]	June 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 $ (387 ) $ 543 $ 930 $ (341 ) $ 589 10.0 5.8 Non-compete agreement 270 (198 ) 72 270 (190 ) 80 2.0 - 5.0 4.5 Trade secrets 250 (208 ) 42 250 (183 ) 67 5.0 0.8 Trade names 1,080 (270 ) 810 1,080 - 1,080 2.0 1.5 Software technology 9,229 (445 ) 8,784 8,229 - 8,229 10.0 9.5 Customer relationships 10,070 (1,800 ) 8,270 10,070 (1,031 ) 9,039 6.0 - 9.0 5.3 Total intangible assets $ 21,829 $ (3,308 ) $ 18,521 $ 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 $ 1,581 2019 3,128 2020 2,571 2021 2,571 2022 2,571 Thereafter 6,099 Total estimated amortization expense $ 18,521

Note 6 - Fair Value Measureme22

Note 6 - Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	June 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 $ 8,366 $ - $ - $ 3,034 $ - $ - Total $ 8,366 $ - $ - $ 3,034 $ - $ -

Note 7 - Marketable Securities

Note 7 - Marketable Securities (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Debt Securities, Held-to-maturity [Table Text Block]	June 30, 2018 (in thousands) Cost Unrealized Gains Unrealized Losses Fair Value U.S. municipal securities $ 18,013 $ - $ (58 ) $ 17,955 Corporate debt securities 34,346 - (157 ) 34,189 U.S. government agency securities 24,674 - (178 ) 24,496 Certificates of deposit/time deposits 3,968 - (38 ) 3,930 Commercial paper 1,254 - (0 ) 1,254 Total marketable securities $ 82,255 $ - $ (431 ) $ 81,824 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]	June 30, (in thousands) 2018 Due in one year or less $ 57,619 Due after one year through five years 24,636 Total marketable securities $ 82,255

Note 8 - Inventory (Tables)

Note 8 - Inventory (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Schedule of Inventory, Current [Table Text Block]	June 30, December 31, (in thousands) 2018 2017 Raw materials $ 9,382 $ 9,767 Work in process 712 1,998 Total inventory 10,094 11,765 Allowance for obsolescence (504 ) (494 ) Inventory, net of allowance $ 9,590 $ 11,271

Note 9 - Stock-based Compensa25

Note 9 - Stock-based Compensation (Tables)	6 Months Ended
	Jun. 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 34,386 109.91 Exercised (108,941 ) 37.04 Forfeited (17,077 ) 61.30 Options outstanding at June 30, 2018 307,765 $ 62.14 Exercisable at June 30, 2018 168,243 $ 49.52
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Six Months Ended June 30, 2018 2017 Risk-free interest rate 2.52 - 3.07% 2.24% Expected life (years) 6.25 6.50 Expected volatility 41.95 - 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 103,818 115.20 Restrictions lapsed (83,390 ) 62.84 Forfeited (21,969 ) 62.28 Restricted stock at June 30, 2018 333,067 $ 79.64
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 June 30, 2018 52,140 $ 76.54
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]	Six Months Ended June 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 C26

Note 10 - Accumulated Other Comprehensive Loss (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Comprehensive Income (Loss) [Table Text Block]	Three Months Ended Six Months Ended June 30, June 30, (in thousands) 2018 2017 2018 2017 Foreign currency translation adjustments Balance at beginning of period $ (2,841 ) $ (9,568 ) $ (5,234 ) $ (10,753 ) Other comprehensive income (loss) before reclassifications (3,518 ) 2,164 (1,125 ) 3,349 Amounts reclassified from accumulated other comprehensive loss - - - - Net current-period other comprehensive income (loss) (3,518 ) 2,164 (1,125 ) 3,349 Balance at end of period $ (6,359 ) $ (7,404 ) $ (6,359 ) $ (7,404 )

Note 12 - Segment Reporting (Ta

Note 12 - Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Income from Operations by Geographic Area [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2018 2017 2018 2017 Income from Operations: United States $ 30,459 $ 25,723 $ 60,532 $ 50,069 Europe 4,022 2,335 7,401 6,375 Corporate Unallocated and Japan (12,497 ) (11,656 ) (24,221 ) (22,360 ) Total Income from Operations $ 21,984 $ 16,402 $ 43,712 $ 34,084
Long-lived Assets by Geographic Areas [Table Text Block]	June 30, December 31, (in thousands) 2018 2017 Total long-lived assets: United States $ 156,831 $ 125,308 Europe 33,194 33,691 Japan 7,314 7,441 Total Assets $ 197,339 $ 166,440
Operating Segments [Member]
Notes Tables
Revenue from External Customers by Geographic Areas [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2018 2017 2018 2017 Revenue: United States $ 86,354 $ 63,353 $ 170,521 $ 123,529 Europe 20,213 16,131 40,158 33,130 Japan 3,085 2,556 6,718 5,548 Total revenue $ 109,652 $ 82,040 $ 217,397 $ 162,207

Note 2 - Recent Accounting Pr28

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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018
Revenue from Contract with Customer, Including Assessed Tax	$ 109,652	$ 82,040	$ 217,397	$ 162,207
Cost of Goods and Services Sold, Total	50,439	$ 35,671	100,276	70,565
Increase (Decrease) in Accounts Receivable			2,648	6,914
Increase (Decrease) in Inventories, Total			(389)	(175)
Accounting Standards Update 2014-09 [Member]
Revenue from Contract with Customer, Including Assessed Tax	(200)		100
Cost of Goods and Services Sold, Total	(100)		100
Increase (Decrease) in Accounts Receivable	(200)		$ 2,700
Increase (Decrease) in Inventories, Total	$ 100			$ (1,200)
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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue	$ 109,652	$ 82,040	$ 217,397	$ 162,207
Injection Molding (Protomold) [Member]
Revenue	51,586	46,792	102,929	94,708
CNC Machining (Firstcut) [Member]
Revenue	37,788	24,180	74,519	46,152
3D Printing (Fineline) [Member]
Revenue	13,248	10,873	25,573	20,958
Sheet Metal [Member]
Revenue	6,309		12,550
Other Products [Member]
Revenue	721	195	1,826	389
UNITED STATES
Revenue	86,354	63,353	170,521	123,529
Europe [Member]
Revenue	20,213	16,131	40,158	33,130
JAPAN
Revenue	$ 3,085	$ 2,556	$ 6,718	$ 5,548

Note 4 - Net Income Per Commo31

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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income	$ 18,314	$ 12,086	$ 36,365	$ 24,286
Basic - weighted-average shares outstanding: (in shares)	26,972,990	26,541,978	26,925,673	26,554,262
Employee stock options and other (in shares)	301,892	107,174	306,542	155,955
Diluted - weighted-average shares outstanding: (in shares)	27,274,882	26,649,152	27,232,215	26,710,217
Basic (in dollars per share)	$ 0.68	$ 0.46	$ 1.35	$ 0.91
Diluted (in dollars per share)	$ 0.67	$ 0.45	$ 1.34	$ 0.91

Note 5 - Goodwill and Other I32

Note 5 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Goodwill, Acquired During Period			$ 248
Amortization of Intangible Assets, Total	$ 800	$ 100	1,600	$ 300
Rapid [Member]
Goodwill, Acquired During Period			$ 200

Note 5 - Goodwill and Other I33

Note 5 - Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 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 I34

Note 5 - Goodwill and Other Intangible Assets - Intangible Assets Other Than Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Gross	$ 21,829	$ 20,829
Accumulated amortization	(3,308)	(1,745)
Net	18,521	19,084
Marketing-Related Intangible Assets [Member]
Gross	930	930
Accumulated amortization	(387)	(341)
Net	$ 543	589
Useful life (Year)	10 years
Weighted average useful life remaining (Year)	5 years 292 days
Noncompete Agreements [Member]
Gross	$ 270	270
Accumulated amortization	(198)	(190)
Net	$ 72	80
Weighted average useful life remaining (Year)	4 years 182 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	(208)	(183)
Net	$ 42	67
Useful life (Year)	5 years
Weighted average useful life remaining (Year)	292 days
Trade Names [Member]
Gross	$ 1,080	1,080
Accumulated amortization	(270)
Net	$ 810	1,080
Useful life (Year)	2 years
Weighted average useful life remaining (Year)	1 year 182 days
Computer Software, Intangible Asset [Member]
Gross	$ 9,229	8,229
Accumulated amortization	(445)
Net	$ 8,784	8,229
Useful life (Year)	10 years
Weighted average useful life remaining (Year)	9 years 182 days
Customer Relationships [Member]
Gross	$ 10,070	10,070
Accumulated amortization	(1,800)	(1,031)
Net	$ 8,270	$ 9,039
Weighted average useful life remaining (Year)	5 years 109 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 I35

Note 5 - Goodwill and Other Intangible Assets - Estimated Aggregated Amortization Expense (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Remaining 2,018	$ 1,581
2,019	3,128
2,020	2,571
2,021	2,571
2,022	2,571
Thereafter	6,099
Total estimated amortization expense	$ 18,521	$ 19,084

Note 6 - Fair Value Measureme36

Note 6 - Fair Value Measurements - Fair Value of Financial Assets Measured on a Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Inputs, Level 1 [Member]
Money market mutual fund	$ 8,366	$ 3,034
Total	8,366	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 Securitie37

Note 7 - Marketable Securities - Short-term and Long-term Marketable Securities (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Amortized Cost	$ 82,255,000	$ 94,458,000
Unrealized Gains
Unrealized Losses	(431,000)	(463,000)
Fair Value	81,824,000	93,995,000
Bank Time Deposits [Member]
Amortized Cost	3,968,000	3,968,000
Unrealized Gains
Unrealized Losses	(38,000)	(32,000)
Fair Value	3,930,000	3,936,000
Commercial Paper [Member]
Amortized Cost	1,254,000
Unrealized Gains
Unrealized Losses	0
Fair Value	1,254,000
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	18,013,000	28,364,000
Unrealized Gains
Unrealized Losses	(58,000)	(104,000)
Fair Value	17,955,000	28,260,000
Corporate Debt Securities [Member]
Amortized Cost	34,346,000	29,806,000
Unrealized Gains
Unrealized Losses	(157,000)	(128,000)
Fair Value	34,189,000	29,678,000
US Government Agencies Debt Securities [Member]
Amortized Cost	24,674,000	32,320,000
Unrealized Gains
Unrealized Losses	(178,000)	(199,000)
Fair Value	$ 24,496,000	$ 32,121,000

Note 7 - Marketable Securitie38

Note 7 - Marketable Securities - Balance of Held-to-maturity Debt Securities by Contractual Maturity (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Due in one year or less	$ 57,619,000
Due after one year through five years	24,636,000
Total marketable securities	$ 82,255,000	$ 94,458,000

Note 8 - Inventory - Inventory

Note 8 - Inventory - Inventory (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Raw materials	$ 9,382	$ 9,767
Work in process	712	1,998
Total inventory	10,094	11,765
Allowance for obsolescence	(504)	(494)
Inventory, net of allowance	$ 9,590	$ 11,271

Note 9 - Stock-based Compensa40

Note 9 - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			10 years
Share-based Compensation, Total	$ 2,700	$ 2,200	$ 5,034	$ 3,958
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 49.76
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, Total	4,400		$ 4,400
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			3 years 109 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	25,100		$ 25,100
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			3 years 182 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	$ 2,900		$ 2,900
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 109 days
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 Compensa41

Note 9 - Stock-based Compensation - Stock Option Activity (Details)	6 Months Ended
	Jun. 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	34,386
Granted, weighted- average exercise price (in dollars per share) | $ / shares	$ 109.91
Exercised (in shares) | shares	(108,941)
Exercised, weighted- average exercise price (in dollars per share) | $ / shares	$ 37.04
Forfeited (in shares) | shares	(17,077)
Forfeited, weighted- average exercise price (in dollars per share) | $ / shares	$ 61.30
Options outstanding (in shares) | shares	307,765
Options outstanding, weighted- average exercise price (in dollars per share) | $ / shares	$ 62.14
Options exercisable (in shares) | shares	168,243
Options exercisable, weighted- average exercise price (in dollars per share) | $ / shares	$ 49.52

Note 9 - Stock-based Compensa42

Note 9 - Stock-based Compensation - Assumptions Used in the Black-Scholes Option Pricing Model (Details) - Employee Stock Option [Member]	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Risk-free interest rate		2.24%
Expected life (years) (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 life (years) (Year)	6 years 91 days
Expected volatility	41.95%
Expected dividend yield	0.00%
Maximum [Member]
Risk-free interest rate	3.07%
Expected life (years) (Year)	6 years 91 days
Expected volatility	42.22%
Expected dividend yield	0.00%

Note 9 - Stock-based Compensa43

Note 9 - Stock-based Compensation - Non-vested Restricted Stock Options (Details) - Restricted Stock [Member]	6 Months Ended
	Jun. 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	103,818
Granted, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 115.20
Restrictions lapsed (in shares) | shares	(83,390)
Restrictions lapsed, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 62.84
Forfeited (in shares) | shares	(21,969)
Forfeited, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 62.28
Restricted stock (in shares) | shares	333,067
Restricted stock, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 79.64

Note 9 - Stock-based Compensa44

Note 9 - Stock-based Compensation - Performance Stock (Details) - Performance Shares [Member]	6 Months Ended
	Jun. 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 Compensa45

Note 9 - Stock-based Compensation - Assumptions Used to Estimate the Fair Value of the ESPP (Details) - ESPP [Member]	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Risk-free interest rate
Expected life (months) (Month)	180 days	180 days
Expected volatility
Expected dividend yield	0.00%	0.00%
Minimum [Member]
Risk-free interest rate	1.48%	0.59%
Expected life (months) (Month)	180 days	180 days
Expected volatility	24.49%	34.51%
Expected dividend yield	0.00%	0.00%
Maximum [Member]
Risk-free interest rate	2.06%	0.97%
Expected life (months) (Month)	180 days	180 days
Expected volatility	31.50%	39.51%
Expected dividend yield	0.00%	0.00%

Note 10 - Accumulated Other C46

Note 10 - Accumulated Other Comprehensive Loss - Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Balance beginning of period			$ 461,215
Balance at end of period	$ 506,253		506,253
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance beginning of period	(2,841)	$ (9,568)	(5,234)	$ (10,753)
Other comprehensive income (loss) before reclassifications	(3,518)	2,164	(1,125)	3,349
Amounts reclassified from accumulated other comprehensive loss
Net current-period other comprehensive income (loss)	(3,518)	2,164	(1,125)	3,349
Balance at end of period	$ (6,359)	$ (7,404)	$ (6,359)	$ (7,404)

Note 11 - Income Taxes (Details

Note 11 - 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	$ 4,478		$ 5,489	$ 8,333	$ 11,286
Effective Income Tax Rate Reconciliation, Percent, Total	19.60%		31.20%	18.60%	31.70%
Effective Income Tax Rate, Increase (Decrease), Percentage	(11.60%)	(13.10%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%			21.00%
Unrecognized Tax Benefits, Ending Balance	$ 4,400			$ 4,400		$ 4,200

Note 12 - Segment Reporting - R

Note 12 - Segment Reporting - Revenue from Operations by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue	$ 109,652	$ 82,040	$ 217,397	$ 162,207
Operating Segments [Member] | United States Segment [Member]
Revenue	86,354	63,353	170,521	123,529
Operating Segments [Member] | Europe Segment [Member]
Revenue	20,213	16,131	40,158	33,130
Operating Segments [Member] | Japan Segment [Member]
Revenue	$ 3,085	$ 2,556	$ 6,718	$ 5,548

Note 12 - Segment Reporting - I

Note 12 - Segment Reporting - Income From Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income from operations	$ 21,984	$ 16,402	$ 43,712	$ 34,084
Operating Segments [Member] | United States Segment [Member]
Income from operations	30,459	25,723	60,532	50,069
Operating Segments [Member] | Europe Segment [Member]
Income from operations	4,022	2,335	7,401	6,375
Corporate and Reconciling Items [Member] | Corporate Unallocated and Japan Segment[Member]
Income from operations	$ (12,497)	$ (11,656)	$ (24,221)	$ (22,360)

Note 12 - Segment Reporting - L

Note 12 - Segment Reporting - Long-lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Long-lived assets	$ 197,339	$ 166,440
Operating Segments [Member] | United States Segment [Member]
Long-lived assets	156,831	125,308
Operating Segments [Member] | Europe Segment [Member]
Long-lived assets	33,194	33,691
Operating Segments [Member] | Japan Segment [Member]
Long-lived assets	$ 7,314	$ 7,441