Proto Labs (PRLB) 10-K 26 Feb 20 2019 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 14, 2020	Jun. 30, 2019
Document Information [Line Items]
Entity Central Index Key	0001443669
Entity Registrant Name	Proto Labs Inc
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2019
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-35435
Entity Incorporation, State or Country Code	MN
Entity Tax Identification Number	41-1939628
Entity Address, Address Line One	5540 Pioneer Creek Drive
Entity Address, City or Town	Maple Plain
Entity Address, State or Province	MN
Entity Address, Postal Zip Code	55359
City Area Code	763
Local Phone Number	479-3680
Title of 12(b) Security	Common Stock, Par Value $0.001 Per Share
Trading Symbol	PRLB
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 3,100,000,000
Entity Common Stock, Shares Outstanding		26,787,910

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 125,225	$ 85,046
Short-term marketable securities	35,437	46,750
Accounts receivable, net of allowance for doubtful accounts of $952 and $919 as of December 31, 2019 and December 31, 2018, respectively	57,450	59,155
Inventory	10,075	10,087
Prepaid expenses and other current assets	8,232	8,567
Income taxes receivable	0	5,757
Total current assets	236,419	215,362
Property and equipment, net	263,712	228,001
Goodwill	128,752	128,752
Other intangible assets, net	17,369	19,850
Long-term marketable securities	12,960	23,579
Operating lease assets	11,425	0
Other long-term assets	3,030	3,441
Total assets	673,667	618,985
Current liabilities
Accounts payable	16,804	17,411
Accrued compensation	15,058	18,130
Accrued liabilities and other	11,057	16,702
Current operating lease liabilities	3,340	0
Income taxes payable	1,322	491
Total current liabilities	47,581	52,734
Long-term operating lease liabilities	8,565	0
Long-term deferred tax liabilities	26,283	20,162
Other long-term liabilities	5,448	4,592
Total liabilities	87,877	77,488
Shareholders' equity
Preferred stock, $0.001 par value, authorized 10,000,000 shares; issued and outstanding 0 shares as of December 31, 2019 and December 31, 2018, respectively	0	0
Common stock, $0.001 par value, authorized 150,000,000 shares; issued and outstanding 26,786,459 and 26,984,747 shares as of December 31, 2019 and December 31, 2018, respectively	27	27
Additional paid-in capital	268,059	258,502
Retained earnings	324,722	291,460
Accumulated other comprehensive loss	(7,018)	(8,492)
Total shareholders' equity	585,790	541,497
Total liabilities and shareholders' equity	$ 673,667	$ 618,985

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Allowance for doubtful accounts	$ 952	$ 919
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)	26,786,459	26,984,747
Common stock, shares outstanding (in shares)	26,786,459	26,984,747

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statements of Operations:
Revenue	$ 458,728	$ 445,596	$ 344,490
Cost of revenue	223,438	206,917	150,648
Gross profit	235,290	238,679	193,842
Operating expenses
Marketing and sales	72,976	68,533	56,856
Research and development	32,692	28,735	23,560
General and administrative	49,766	52,513	41,200
Total operating expenses	155,434	149,781	121,616
Income from operations	79,856	88,898	72,226
Other income, net	1,337	2,757	2,209
Income before income taxes	81,193	91,655	74,435
Provision for income taxes	17,538	15,067	22,657
Net income	$ 63,655	$ 76,588	$ 51,778
Net income per share:
Basic (in dollars per share)	$ 2.37	$ 2.84	$ 1.94
Diluted (in dollars per share)	$ 2.35	$ 2.81	$ 1.93
Shares used to compute net income per share:
Basic (in shares)	26,866,985	26,982,614	26,647,610
Diluted (in shares)	27,049,423	27,278,816	26,845,071
Other Comprehensive (Loss) Income, net of tax
Foreign currency translation adjustments	$ 1,474	$ (3,258)	$ 5,519
Comprehensive income	$ 65,129	$ 73,330	$ 57,297

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2016	26,504,868
Balance at Dec. 31, 2016	$ 26	$ 213,857	$ 176,703	$ (10,753)	$ 379,833
Common shares issued on exercise of options and other (in shares)	283,449
Common shares issued on exercise of options and other	$ 1	8,603	0	0	8,604
Common shares issued for RAPID acquisition (in shares)	118,140
Common shares issued for RAPID acquisition	$ 1	11,335	0	0	11,336
Stock-based compensation expense	$ 0	8,558	0	0	8,558
Repurchases of Common Stock (in shares)	(77,806)
Repurchases of Common Stock	$ (1)	(628)	(3,784)	0	(4,413)
Net income	0	0	51,778	0	51,778
Other Comprehensive (Loss) Income, net of tax
Foreign currency translation adjustments	$ 0	0	0	5,519	5,519
Comprehensive income					57,297
Common shares issued on exercise of options and other (in shares)	283,449
Common shares issued on exercise of options and other	$ 1	8,603	0	0	8,604
Stock-based compensation expense	$ 0	8,558	0	0	8,558
Repurchases of Common Stock (in shares)	(77,806)
Repurchases of Common Stock	$ (1)	(628)	(3,784)	0	(4,413)
Net income	$ 0	0	51,778	0	51,778
Balance (in shares) at Dec. 31, 2017	26,828,651
Balance at Dec. 31, 2017	$ 27	241,725	224,697	(5,234)	461,215
Common shares issued on exercise of options and other (in shares)	260,694
Common shares issued on exercise of options and other	$ 0	6,791	0	0	6,791
Stock-based compensation expense	$ 0	10,928	0	0	10,928
Repurchases of Common Stock (in shares)	(104,598)
Repurchases of Common Stock	$ 0	(942)	(11,287)	0	(12,229)
Net income	0	0	76,588	0	76,588
Other Comprehensive (Loss) Income, net of tax
Foreign currency translation adjustments	$ 0	0	0	(3,258)	(3,258)
Comprehensive income					73,330
Common shares issued on exercise of options and other (in shares)	260,694
Common shares issued on exercise of options and other	$ 0	6,791	0	0	6,791
Stock-based compensation expense	$ 0	10,928	0	0	10,928
Repurchases of Common Stock (in shares)	(104,598)
Repurchases of Common Stock	$ 0	(942)	(11,287)	0	(12,229)
Net income	$ 0	0	76,588	0	$ 76,588
Balance (in shares) at Dec. 31, 2018	26,984,747				26,984,747
Balance at Dec. 31, 2018	$ 27	258,502	291,460	(8,492)	$ 541,497
Other Comprehensive (Loss) Income, net of tax
Revenue recognition transition adjustment	$ 0	0	1,462	0	1,462
Common shares issued on exercise of options and other (in shares)	128,174
Common shares issued on exercise of options and other	$ 0	1,904	0	0	1,904
Stock-based compensation expense	$ 0	10,781	0	0	10,781
Repurchases of Common Stock (in shares)	(326,462)
Repurchases of Common Stock	$ 0	(3,128)	(30,393)	0	(33,521)
Net income	0	0	63,655	0	63,655
Foreign currency translation adjustments	$ 0	0	0	1,474	1,474
Comprehensive income					65,129
Common shares issued on exercise of options and other (in shares)	128,174
Common shares issued on exercise of options and other	$ 0	1,904	0	0	1,904
Stock-based compensation expense	$ 0	10,781	0	0	10,781
Repurchases of Common Stock (in shares)	(326,462)
Repurchases of Common Stock	$ 0	(3,128)	(30,393)	0	(33,521)
Net income	$ 0	0	63,655	0	$ 63,655
Balance (in shares) at Dec. 31, 2019	26,786,459				26,786,459
Balance at Dec. 31, 2019	$ 27	$ 268,059	$ 324,722	$ (7,018)	$ 585,790

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities
Net income	$ 63,655	$ 76,588	$ 51,778
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	30,864	26,754	18,474
Share-based Payment Arrangement, Noncash Expense, Total	10,781	10,928	8,558
Deferred taxes	6,106	11,936	1,174
Loss on impairment of assets	0	0	513
Gain on sale of businesses	0	(671)	0
Amortization of held-to-maturity securities	5	374	1,063
Other	391	(619)	(153)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	1,848	(6,098)	(9,933)
Inventories	60	(189)	(985)
Prepaid expenses and other	545	(2,098)	(691)
Income taxes	6,555	(6,652)	1,646
Accounts payable	(719)	1,942	3,176
Accrued liabilities and other	(4,039)	10,734	7,128
Net cash provided by operating activities	116,052	122,929	81,748
Investing activities
Purchases of property, equipment and other capital assets	(62,230)	(87,104)	(32,635)
Cash used for acquisitions, net of cash acquired	0	(90)	(110,533)
Proceeds from sale of businesses	0	284	0
Purchases of other assets and investments	(4,000)	(126)	(8,742)
Purchases of marketable securities	(46,403)	(41,384)	(20,037)
Proceeds from maturities of marketable securities	68,330	65,139	47,972
Net cash used in investing activities	(44,303)	(63,281)	(123,975)
Financing activities
Payments on debt	0	(5,000)	0
Proceeds from issuance of debt	0	0	5,000
Proceeds from exercises of stock options	4,391	8,935	8,602
Purchases of shares withheld for tax obligations	(2,487)	(2,144)	0
Repurchases of common stock	(33,521)	(12,229)	(4,410)
Net cash used in financing activities	(31,617)	(10,438)	9,192
Effect of exchange rate changes on cash and cash equivalents	47	(871)	947
Net increase (decrease) in cash and cash equivalents	40,179	48,339	(32,088)
Cash and cash equivalents, beginning of period	85,046	36,707	68,795
Cash and cash equivalents, end of period	125,225	85,046	36,707
Supplemental cash flow disclosure
Cash paid for interest	14	39	19
Cash paid for taxes	$ 4,002	$ 9,966	$ 19,113

Note 1 - Nature of Business

Note 1 - Nature of Business	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	Note 1 Organization and business Proto Labs, Inc. and its subsidiaries (Proto Labs, the Company, we, us, or our) is an e-commerce driven digital manufacturer of quick-turn, on-demand injection-molded, computer numerical control (CNC) machined, 3D three 3D 3D Name Location PL-US International LLC United States Rapid Management Group LLC United States Rapid Sheet Metal LLC (RSM) United States Rapid Manufacturing LLC (RM) United States Proto Labs Ltd. United Kingdom PL International Holdings, UK, Ltd. United Kingdom PL Euro Services Limited United Kingdom Proto Labs GmbH Germany Proto Labs Tooling GmbH Germany Proto Labs, G.K. Japan

Note 2 - Summary of Significant

Note 2 - Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Significant Accounting Policies [Text Block]	Note 2 Principles of consolidation The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries, as listed within “Organization and business” above. All intercompany accounts and transactions have been eliminated in consolidation. Comprehensive income Components of comprehensive income include net income and foreign currency translation adjustments. Comprehensive income is disclosed in the accompanying consolidated statements of comprehensive income and consolidated statements of shareholders’ equity. Accounting estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (U.S. GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and related disclosures at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Cash and cash equivalents Cash and cash equivalents include cash and other investments, including marketable securities, with maturities of three may not Marketable securities Marketable securities include held-to-maturity debt securities recorded at amortized cost. Management determines the appropriate classification of debt securities at the time of purchase and reevaluates such designation as of each balance sheet date. Debt securities are classified as held-to-maturity when the Company has the positive intent and ability to hold the securities to maturity. Held-to-maturity securities are stated at amortized cost, adjusted for amortization of premiums and accretion of discounts to maturity computed under the effective interest method. Such amortization is included in other income, net. Interest on securities classified as held to maturity is included in other income, net. The classification of marketable securities as current or non-current is dependent upon the security’s maturity date. Securities with maturities of three 320, Investments – Debt and Equity Securities, Accounts receivable and allowance for doubtful accounts Accounts receivable are reported at the invoiced amount less an allowance for doubtful accounts. As of each balance sheet date, the Company evaluates its accounts receivable and establishes an allowance for doubtful accounts based on a combination of specific customer circumstances and credit conditions taking into account the history of write-offs and collections. A receivable is considered past due if payment has not Inventory 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 Property, equipment and leasehold improvements Property, equipment and leasehold improvements are stated at cost. Major improvements that substantially extend an asset’s useful life are capitalized. Repairs, maintenance and minor improvements are charged to operations as incurred. Depreciation, including amortization of leasehold improvements and assets recorded under capital leases, is calculated using the straight-line method over the estimated useful lives of the individual assets and ranges from 3 to 39 years. Manufacturing equipment is depreciated over 3 to 15 years, office furniture and equipment are depreciated over 3 to 7 years, computer hardware and software are depreciated over 3 to 5 years, building costs are depreciated over 39 years, leasehold improvements are depreciated over the estimated lives of the related assets or the life of the lease, whichever is shorter, and building and land improvements are depreciated over 10 to 39 years. Assets not not The Company follows ASC 350 40, Internal-Use Software December 31, 2019 2018, December 31, 2019 $16.1 Goodwill The Company recognizes goodwill in accordance with ASC 350, Intangibles—Goodwill and Other not fourth may Other Intangible Assets Other intangible assets include software technology, customer relationships and other intangible assets acquired from other independent parties. Other intangible assets with a definite life are amortized over a period ranging from two may not Accounting for long-lived assets The Company periodically reviews the carrying amount of its property, equipment and leasehold improvements to determine if circumstances exist indicating an impairment or if depreciation periods should be modified. If facts or circumstances indicate that an impairment may Revenue recognition On January 1, 2018, 606, Revenue from Contracts with Customers, no two Prior to 2018, 3D Leases On January 1, 2019, 842, Leases Income taxes The Company accounts for income taxes in accordance with ASC 740, Income Taxes 740 may not ASC 740 not 740 Stock-based compensation The Company accounts for stock-based compensation in accordance with ASC 718, Compensation—Stock Compensation 718 718, not In determining the compensation cost of the options granted, the fair value of options granted has been estimated on the date of grant using the Black-Scholes option-pricing model. Advertising costs Advertising is expensed as incurred and was approximately $13.0 million, $11.8 million and $10.7 million for the years ended December 31, 2019, 2018 2017, Research and development Research and development expenses consist primarily of personnel and outside service costs related to the development of new processes and product lines, enhancements of existing product lines, development of software for internal use, maintenance of internally developed software, quality assurance and testing. Costs for internal use software are evaluated by project and capitalized where appropriate under ASC 350 40, Intangibles - Goodwill and Other, Internal-Use Software December 31, 2019, 2018 2017, Foreign currency translation/transactions The Company translated the balance sheets of its foreign subsidiaries at period-end exchange rates and the income statement at the average exchange rates in effect throughout the period. The Company has recorded the translation adjustment as a separate component of consolidated shareholders’ equity. Foreign currency transaction gains and losses are recognized in the consolidated statements of comprehensive income. Business combinations The Company accounts for business combinations in accordance with ASC 805, Business Combinations 805 November 30, 2017, Recently adopted accounting pronouncements During the fourth 2019, 2017 04, Intangibles – Goodwill and Other, no During the first 2019, 2016 02, Leases 842 2018 11, Leases 840, Leases 12 January 1, 2019 During the first 2018, 2014 09, Revenue from Contracts with Customers 606 no two January 1, 2018. During the first 2018, 2017 09, Compensation – Stock Compensation not Recently issued accounting pronouncements In December 2019, 2019 12, Income Taxes December 15, 2020 not In June 2016, 2016 13, Financial Instruments – Credit Losses, December 15, 2019 not

Note 3 - Revenue

Note 3 - Revenue	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	Note 3 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. January 1, 2018 606. 606 December 31, 2018, December 31, 2018, 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 years ended December 31, 2019, 2018 2017 Year Ended December 31, (in thousands) 2019 2018 2017 Revenue: United States $ 360,205 $ 350,535 $ 263,086 Europe 82,805 80,889 70,154 Japan 15,718 14,172 11,250 Total revenue $ 458,728 $ 445,596 $ 344,490 Revenue by product line for the years ended December 31, 2019, 2018 2017 Year Ended December 31, (in thousands) 2019 2018 2017 Revenue: Injection Molding $ 217,415 $ 210,523 $ 194,432 CNC Machining 155,473 153,521 103,739 3D Printing 61,352 53,342 43,329 Sheet Metal 21,000 24,998 1,767 Other Revenue 3,488 3,212 1,223 Total revenue $ 458,728 $ 445,596 $ 344,490 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	12 Months Ended
	Dec. 31, 2019
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 the 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 and other stock-based awards granted under stock-based compensation plans and shares committed to be purchased under the employee stock purchase plan. The following table presents the calculation of net income per basic and diluted share attributable to common shareholders: Year Ended December 31, (in thousands, except share and per share amounts) 2019 2018 2017 Net Income $ 63,655 $ 76,588 $ 51,778 Basic - weighted-average shares outstanding: 26,866,985 26,982,614 26,647,610 Effect of dilutive securities: Employee stock options and other 182,438 296,202 197,461 Diluted - weighted-average shares outstanding: 27,049,423 27,278,816 26,845,071 Net income per share attributable to common shareholders: Basic $ 2.37 $ 2.84 $ 1.94 Diluted $ 2.35 $ 2.81 $ 1.93

Note 5 - Business Combinations

Note 5 - Business Combinations	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Business Combination Disclosure [Text Block]	Note 5 On November 30, 2017, RAPID is a New Hampshire-based custom parts supplier specializing in quick-turn sheet metal fabrication and CNC machining. With the acquisition, the Company offers its customers another quick-turn manufacturing service while expanding its CNC machining capabilities. The acquisition has been accounted for under the acquisition method of accounting in accordance with ASC 805. The RAPID amortizable intangible assets were valued as of the acquisition date and were deemed to have a weighted-average useful life of 5.5 years. The customer relationships were valued at $7.5 million based on the Multi-Period Excess Earnings Method and are amortized over 6.0 years. The trade names were valued at $1.1 million based on the Relief-from-Royalty Method and are amortized over 2.0 years. The non-competition agreement was valued at $0.1 million based on the Discounted Cash Flow method and will be amortized over 5 years. The allocation of the purchase price to assets acquired and liabilities assumed is as follows: (in thousands) Assets acquired: Current assets $ 6,720 Goodwill 99,836 Other intangible assets 8,700 Other long-term assets 8,855 Total assets acquired 124,111 Liabilities assumed: Current liabilities 2,067 Other long-term liabilities 85 Total liabilities assumed 2,152 Net assets acquired $ 121,959 Cash paid $ 115,378 Cash acquired (4,755 ) Net cash consideration 110,623 Equity portion of purchase price 11,336 Total purchase consideration $ 121,959 The following unaudited pro forma information represents the Company’s results of operations as if the fiscal 2017 2016. may not Year Ended December 31, (in thousands) 2017 2016 (unaudited) Revenue $ 386,677 $ 336,634 Net income 55,070 41,805 The unaudited pro forma net income for the year ended December 31, 2017 December 31, 2016 December 31, 2017 2016 may not not January 1, 2016. 2017

Note 6 - Goodwill and Other Int

Note 6 - Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	Note 6 The changes in the carrying amount of goodwill for the years ended December 31, 2019 2018 (in thousands) Dec. 31, 2017 Goodwill acquired during 2018 Dec. 31, 2018 Goodwill acquired during 2019 Dec. 31, 2019 United States $ 123,635 $ 248 $ 123,883 $ - $ 123,883 Europe 4,239 - 4,239 - 4,239 Japan 630 - 630 - 630 Total goodwill $ 128,504 $ 248 $ 128,752 $ - $ 128,752 As described in Note 5 November 2017. December 31, 2017 December 31, 2018. Intangible assets other than goodwill for the years ended December 31, 2019 2018 Year Ended December 31, 2019 Year Ended December 31, 2018 Weighted Average Useful Life (in thousands) Gross Accumulated Amortization Net Gross Accumulated Amortization Net Useful Life (in years) Remaining (in years) Intangible Assets with finite lives: Marketing assets $ 930 $ (527 ) $ 403 $ 930 $ (434 ) $ 496 10.0 4.3 Non-compete agreement 270 (222 ) 48 270 (206 ) 64 2.0 - 5.0 3.0 Trade secrets 250 (250 ) - 250 (233 ) 17 5.0 0.0 Trade names 1,080 (1,080 ) - 1,080 (540 ) 540 2.0 0.0 Software technology 13,229 (2,275 ) 10,954 12,229 (997 ) 11,232 10.0 8.0 Customer relationships 10,070 (4,106 ) 5,964 10,070 (2,569 ) 7,501 6.0 - 9.0 3.8 Total intangible assets $ 25,829 $ (8,460 ) $ 17,369 $ 24,829 $ (4,979 ) $ 19,850 Amortization expense for intangible assets for the years ended December 31, 2019, 2018 2017 The Company acquired a software company in December 2017, December 31, 2017. not 805. December 31, 2019. December 31, 2018. Estimated aggregated amortization expense based on the current carrying value of the amortizable intangible assets is as follows: (in thousands) Estimated Amortization Expense 2020 $ 3,016 2021 3,016 2022 3,016 2023 2,813 2024 1,400 Thereafter 4,108 Total estimated amortization expense $ 17,369

Note 7 - Fair Value Measurement

Note 7 - Fair Value Measurements	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Fair Value Disclosures [Text Block]	Note 7 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 equivalents measured at fair value as of December 31, 2019 2018, 1 The following tables summarizes financial assets as of December 31, 2019 2018 December 31, 2019 December 31, 2018 (in thousands) Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Financial Assets: Cash and cash equivalents Money market mutual funds $ 68,962 $ - $ - $ 8,943 $ - $ - Total $ 68,962 $ - $ - $ 8,943 $ - $ -

Note 8 - Marketable Securities

Note 8 - Marketable Securities	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Investment [Text Block]	Note 8 The Company invests in short-term and long-term agency, municipal, corporate 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. Information regarding the Company’s short-term and long-term marketable securities as of December 31, 2019 2018 December 31, 2019 (in thousands) Amortized Cost Unrealized Gains Unrealized Losses Fair Value U.S. government agency securities $ 6,274 $ 1 $ (7 ) $ 6,268 Corporate debt securities 26,944 80 (12 ) 27,012 U.S. municipal securities 10,204 9 (3 ) 10,210 Commercial paper 3,491 - - 3,491 Certificates of deposit/time deposits 1,484 22 - 1,506 Total marketable securities $ 48,397 $ 112 $ (22 ) $ 48,487 December 31, 2018 (in thousands) Amortized Cost Unrealized Gains Unrealized Losses Fair Value U.S. government agency securities $ 16,843 $ - $ (88 ) $ 16,755 Corporate debt securities 31,769 - (96 ) 31,673 U.S. municipal securities 17,509 1 (33 ) 17,477 Certificates of deposit/time deposits 4,208 - (25 ) 4,183 Total marketable securities $ 70,329 $ 1 $ (242 ) $ 70,088 Fair values for the U.S. government agency securities and 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. The investment policy adopted by the Company dictates that only investments in quality, highly rated debt securities are permitted. Those unrealized losses displayed above are the result of macroeconomic factors and are indicative of neither the quality of the underlying security nor the issuer’s ability to pay its debt. The Company intends, and has the ability, 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 December 31, 2019 may may December 31, (in thousands) 2019 Due in one year or less $ 35,437 Due after one year through five years 12,960 Total marketable securities $ 48,397

Note 9 - Property and Equipment

Note 9 - Property and Equipment	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	Note 9 Property and equipment consists of the following: December 31, (in thousands) 2019 2018 Land $ 14,098 $ 10,566 Buildings and improvements 75,843 72,819 Machinery and equipment 208,954 185,416 Computer hardware and software 24,953 22,323 Leasehold improvements 7,341 7,330 Construction in progress 54,313 25,279 Total 385,502 323,733 Accumulated depreciation and amortization (121,790 ) (95,732 ) Property and equipment, net $ 263,712 $ 228,001 Depreciation expense for the years ended December 31, 2019, 2018 2017

Note 10 - Inventory

Note 10 - Inventory	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Inventory Disclosure [Text Block]	Note 10 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 consists of the following: December 31, (in thousands) 2019 2018 Raw materials $ 9,818 $ 9,560 Work in process 501 792 Total inventory 10,319 10,352 Allowance for obsolescence (244 ) (265 ) Inventory, net of allowance $ 10,075 $ 10,087

Note 11 - Financing Obligations

Note 11 - Financing Obligations	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Debt Disclosure [Text Block]	Note 11 The Company had no financing obligations as of December 31, 2019 2018.

Note 12 - Employee Benefit Plan

Note 12 - Employee Benefit Plans	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Pension and Other Postretirement Benefits Disclosure [Text Block]	Note 12 The Company maintains a 401 three may may may December 31, 2019, 2018 2017, The Company also sponsors a defined contribution retirement plan that covers the employees in the United Kingdom. Total employer contributions were approximately $0.3 million in each of the years ended December 31, 2019, 2018 2017.

Note 13 - Stock-based Compensat

Note 13 - Stock-based Compensation	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Share-based Payment Arrangement [Text Block]	Note 13 The Company has two 2000 2000 2012 2012 2012 February 21, 2012, not 2000 2012 No 2000 2012 2012 ten may 2012 may not The Company’s 2012 six first 718 Employees purchased 41,615 and 33,562 shares of common stock under the ESPP at an average exercise price of $86.70 and $85.61 during 2019 2018, December 31, 2019, The Company determines its stock-based compensation in accordance with ASC 718, Determining the appropriate fair value model and calculating the fair value of stock option grants requires the input of subjective assumptions. The Company uses the Black-Scholes option pricing model to value its stock option awards. Stock-based compensation expense is calculated using the Company’s best estimates, which involve inherent uncertainties and the application of management’s judgment. Significant estimates include its expected term and stock price volatility. The expected term of stock options is estimated from the vesting period of the award and represents the weighted average period that the Company's stock options are expected to be outstanding. The Company estimates the volatility of its stock price based on the historic volatility of its common stock. The Company bases the risk-free interest rate that it uses in the Black-Scholes option pricing model on U.S. Treasury instruments with maturities similar to the expected term of the award being valued. The Company has never paid and does not zero The following table summarizes stock-based compensation expense for the years ended December 31, 2019, 2018 2017, Year Ended December 31, (in thousands) 2019 2018 2017 Stock options and other $ 9,591 $ 10,113 $ 7,954 Employee stock purchase plan 1,190 815 604 Total stock-based compensation expense $ 10,781 $ 10,928 $ 8,558 Cost of revenue $ 2,056 $ 1,543 $ 970 Operating expenses: Marketing and sales 2,632 1,942 1,429 Research and development 1,851 1,517 1,091 General and administrative 4,242 5,926 5,068 Total stock-based compensation expense $ 10,781 $ 10,928 $ 8,558 Stock Options The following table provides the assumptions used in the Black-Scholes option pricing model for the years ended December 31, 2019, 2018 2017: Year Ended December 31, 2019 2018 2017 Risk-free interest rate 2.35 - 2.58% 2.52 - 3.07% 2.24 - 2.36% Expected life (years) 6.25 6.25 6.5 Expected volatility 42.52 - 42.74% 41.68 - 42.22% 42.68 - 44.68% Expected dividend yield 0% 0% 0% Weighted average grant date fair value $47.84 $50.08 $32.26 The following table summarizes stock option activity and the weighted average exercise price for the years ended December 31, 2019, 2018 2017: Weighted- Average Stock Options Exercise Price Options outstanding at January 1, 2017 569,639 $ 45.00 Granted 60,100 69.06 Exercised (187,313 ) 35.93 Cancelled (43,371 ) 61.02 Options outstanding at December 31, 2017 399,055 51.13 Granted 36,600 110.59 Exercised (155,765 ) 38.92 Cancelled (27,274 ) 74.35 Options outstanding at December 31, 2018 252,616 64.71 Granted 53,708 105.81 Exercised (16,079 ) 48.67 Cancelled (13,979 ) 89.50 Options outstanding at December 31, 2019 276,266 $ 72.38 Exercisable at December 31, 2019 152,423 $ 59.26 The outstanding options have a term of 10 four five first first The total intrinsic value of options exercised during the years ended December 31, 2019, 2018 2017, For options outstanding at December 31, 2019, December 31, 2019, The following table summarizes information about stock options outstanding at December 31, 2019: Options Outstanding, Vested and Expected to Vest Options Exercisable Range of Exercise Prices Number Outstanding Weighted Average Remaining Contractual Life Weighted Average Exercise Price ($) Number Exercisable Weighted Average Exercise Price ($) 7.76 to 31.43 23,883 1.98 25.04 23,883 25.04 31.44 to 66.87 125,022 4.42 58.67 85,656 58.81 66.88 to 96.20 45,255 4.49 70.98 33,445 70.41 96.21 to 123.10 82,106 8.68 107.79 9,439 110.36 The fair value of share-based payment transactions is recognized in the consolidated statements of comprehensive income. As of December 31, 2019, December 31, 2019, 2018 2017, Restricted Stock The 2012 four five first first The following table summarizes restricted stock activity for the years ended December 31, 2019, 2018 2017: Weighted- Average Grant Date Restricted Fair Value Stock Awards Per Share Restricted stock at January 1, 2017 215,105 $ 62.78 Granted 210,744 63.70 Restrictions lapsed (60,102 ) 63.60 Forfeited (30,916 ) 61.99 Restricted stock at December 31, 2017 334,831 63.29 Granted 106,855 115.41 Restrictions lapsed (86,191 ) 63.64 Forfeited (31,574 ) 68.67 Restricted stock at December 31, 2018 323,921 79.85 Granted 115,471 106.35 Restrictions lapsed (92,597 ) 77.25 Forfeited (31,822 ) 87.58 Restricted stock at December 31, 2019 314,973 $ 89.55 As of December 31, 2019, Performance Stock Performance Stock Units (PSUs) are expressed in terms of a target number of PSUs, with anywhere between 0 three The following table summarizes performance stock activity for the years ended December 31, 2019, 2018 2017: Weighted- Average Grant Date Performance Fair Value Stock Awards Per Share Performance stock at January 1, 2017 - $ - Granted 25,707 58.35 Restrictions lapsed - - Forfeited - - 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 December 31, 2018 52,140 76.54 Granted 21,434 104.99 Restrictions lapsed - - Performance change (61,816 ) 88.06 Forfeited (2,375 ) 105.37 Performance stock at December 31, 2019 9,383 $ 58.35 As of December 31, 2019, 2019 2018 Employee Stock Purchase Plan The following table presents the assumptions used to estimate the fair value of the ESPP during the years ended December 31, 2019, 2018 2017: Year Ended December 31, 2019 2018 2017 Risk-free interest rate 1.59 - 2.35% 2.06 - 2.33% 0.97 - 1.48% Expected life (months) 6.00 6.00 6.00 Expected volatility 42.63 - 53.57% 31.50 - 37.36% 24.49 - 34.51% Expected dividend yield 0% 0% 0%

Note 14 - Leases

Note 14 - Leases	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Lessee, Operating Leases [Text Block]	Note 14 The Company’s significant accounting policies are disclosed in Note 2 10 December 31, 2019. 842 The Company accounts for leases in accordance with ASC 842. January 1, 2019, 842, 840 not 842. not January 1, 2019. not 842 not The Company has operating leases for office space, manufacturing facilities and certain company vehicles and equipment. The leases have remaining lease terms of one 12 not may December 31, 2019, not The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease assets, current operating lease liabilities and long-term operating lease liabilities in the Consolidated Balance Sheets and are recognized based on the present value of lease payments over the lease term at commencement date. The majority of the Company’s leases do not Supplemental balance sheet information related to leases was as follows: (in thousands) December 31, 2019 Operating lease assets $ 11,425 Current operating lease liabilities $ 3,340 Long-term operating lease liabilities 8,565 Total operating lease liabilities $ 11,905 Lease expense is recognized on a straight-line basis over the lease term, with variable payments recognized in the period those payments are incurred. The components of lease expense for the periods reported were as follows: Three Months Ended Twelve Months Ended (in thousands) December 31, 2019 December 31, 2019 Operating lease cost $ 976 $ 3,960 Variable lease cost 228 1,039 Total lease cost $ 1,204 $ 4,999 Maturities of operating lease liabilities as of December 31, 2019 ( 842 (in thousands) Operating Leases Year Ending December 31, 2020 $ 4,034 2021 2,835 2022 2,634 2023 1,064 2024 498 After 2024 1,613 Total future minimum lease payments 12,678 Less interest (773 ) Present value of lease liabilities $ 11,905 As of December 31, 2019, not Weighted average remaining lease term and discount rate was as follows: December 31, 2019 Weighted Average Remaining Lease Term (Years) 4.8 Weighted Average Discount Rate 2.6% Supplemental cash flow information related to leases was as follows: Twelve Months Ended (in thousands) December 31, 2019 Cash paid for amounts included in the measurement of operating lease liabilities: Operating cash flows from operating leases $ 5,020 Lease assets obtained in exchange for new operating lease liabilities 1,921

Note 15 - Accumulated Other Com

Note 15 - Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Disclosure of Reclassification Amount [Text Block]	Note 15 Other comprehensive loss is comprised entirely of foreign currency translation adjustments. The following table presents the changes in accumulated other comprehensive loss balances for the years ending December 31, 2019, 2018 2017, Year Ended December 31, (in thousands) 2019 2018 2017 Foreign currency translation adjustments Balance at beginning of period $ (8,492 ) $ (5,234 ) $ (10,753 ) Other comprehensive (loss) income before reclassifications 1,474 (3,258 ) 5,519 Amounts reclassified from accumulated other comprehensive income (loss) - - - Net current-period other comprehensive (loss) income 1,474 (3,258 ) 5,519 Balance at end of period $ (7,018 ) $ (8,492 ) $ (5,234 )

Note 16 - Income Taxes

Note 16 - Income Taxes	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Income Tax Disclosure [Text Block]	Note 16 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 years ended December 31, 2019, 2018 2017, December 31, 2019, 2018 2017 The effective tax rate increased by 5.2% for the year ended December 31, 2019 2018 The Tax Cuts and Jobs Act (the “Act”) was enacted on December 22, 2017. 35% No not The provision for income taxes is based on income before income taxes reported for financial statement purposes. The components of income before income taxes are as follows: Year Ended December 31, (in thousands) 2019 2018 2017 Domestic $ 74,841 $ 81,893 $ 69,929 Foreign 6,352 9,762 4,506 Total $ 81,193 $ 91,655 $ 74,435 Significant components of the provision for income taxes for the following periods are as follows: Year Ended December 31, (in thousands) 2019 2018 2017 Current: Federal $ 6,991 $ (782 ) $ 17,808 State 2,882 2,078 1,367 Foreign 1,544 1,810 2,215 Deferred Federal 5,121 11,325 865 State 269 538 193 Foreign (809 ) (430 ) (1,918 ) Valuation Allowance 1,540 528 2,127 Total $ 17,538 $ 15,067 $ 22,657 A reconciliation of the federal statutory income tax rate to the effective tax rate is as follows: Year Ended December 31, 2019 2018 2017 Federal tax statutory rate 21.0 % 21.0 % 35.0 % State tax (net of federal benefit) 2.1 2.0 1.7 Share based compensation (0.5 ) (2.8 ) (0.8 ) Valuation allowance against deferred tax assets 1.4 0.7 2.9 Research and development credit (2.8 ) (2.5 ) (2.2 ) Foreign rate differential (0.3 ) (0.1 ) (1.9 ) Tax reserves 1.1 (0.1 ) 0.9 Domestic manufacturing deduction - - (2.5 ) Miscellaneous (0.4 ) (0.5 ) (0.2 ) Transition tax - (0.8 ) 3.2 Revaluation of deferred tax liability - (0.5 ) (5.7 ) Total 21.6 % 16.4 % 30.4 % Significant components of deferred tax assets and liabilities are as follows: December 31, (in thousands) 2019 2018 Deferred tax assets: Accrued expenses $ 1,362 $ 931 Leases 3,337 - Warrants and stock options 3,325 2,908 Intangible assets 1,171 748 Inventories 169 154 Other assets 1,765 666 Net operating loss 6,513 6,605 Less valuation allowance (8,248 ) (6,900 ) Total deferred tax assets 9,394 5,112 Deferred tax liabilities: Depreciation (26,750 ) (21,788 ) Goodwill (5,590 ) (3,486 ) Leases (3,337 ) - Total deferred tax liabilities (35,677 ) (25,274 ) Net deferred tax liability $ (26,283 ) $ (20,162 ) The Company has recorded no December 31, 2019. not December 31, 2019, As of December 31, 2019, ten 2020 2026. may €1 €1 The Company establishes valuation allowances for deferred tax assets when, after consideration of all positive and negative evidence, it is considered more-likely-than- not not December 31, 2019 2018, 2019. The Company files a U.S. federal income tax return and income tax returns in various states and foreign jurisdictions. With a few exceptions, the Company is no 2016. The Company has liabilities related to unrecognized tax benefits totaling $4.6 million and $4.1 million at December 31, 2019 2018, December 31, 2019, 2018 2017. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: December 31, 2019 2018 Balance at beginning of period $ 4,096 $ 4,233 Additions for tax positions of current year 592 593 Additions for tax positions of prior years - 309 Decrease related to expiration of statutes of limitations (90 ) (1,039 ) Balance at period end $ 4,598 $ 4,096

Note 17 - Litigation

Note 17 - Litigation	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Legal Matters and Contingencies [Text Block]	Note 17 From time to time, the Company may not

Note 18 - Segment Reporting

Note 18 - Segment Reporting	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	Note 18 The Company’s reportable segments are based on the internal reporting used by the Company’s CEO, who is the chief operating decision maker (CODM), to assess operating performance and make decisions about the allocation of resources. The Company’s reportable segments are based upon geographic region, consisting of the United States and Europe. The Corporate Unallocated and Japan category includes non-reportable segments, as well as research and development and general and administrative costs that are global in nature and that the Company does not Revenue in the United States is derived from Injection Molding, CNC Machining, 3D 3D 3D 3D The accounting policies of the reportable segments are the same as those described in Note 2 not Beginning in 2019, Revenue and income from operations by reportable segment are as follows: Year Ended December 31, (in thousands) 2019 2018 2017 Revenue: United States $ 360,205 $ 350,535 $ 263,086 Europe 82,805 80,889 70,154 Japan 15,718 14,172 11,250 Total revenue $ 458,728 $ 445,596 $ 344,490 Year Ended December 31, (in thousands) 2019 2018 2017 Income from Operations: United States $ 108,594 $ 115,710 $ 99,561 Europe 15,077 16,747 12,796 Corporate Unallocated and Japan (43,815 ) (43,557 ) (40,131 ) Total income from operations $ 79,856 $ 88,898 $ 72,226 Total long-lived assets, expenditures for additions to long-lived assets and depreciation and amortization expense are as follows: December 31, December 31, December 31, (in thousands) 2019 2018 2017 Long-lived assets: United States $ 210,171 $ 185,979 $ 125,308 Europe 45,019 34,577 33,691 Japan 8,522 7,445 7,441 Total long-lived assets $ 263,712 $ 228,001 $ 166,440 Year Ended December 31, (in thousands) 2019 2018 2017 Expenditures for additions to long-lived assets: United States $ 45,123 $ 78,762 $ 20,370 Europe 14,743 7,576 11,704 Japan 2,364 766 561 Total expenditures for additions to long-lived assets $ 62,230 $ 87,104 $ 32,635 Year Ended December 31, (in thousands) 2019 2018 2017 Depreciation and Amortization: United States $ 24,767 $ 21,117 $ 13,267 Europe 4,746 4,679 4,174 Japan 1,351 958 1,033 Total depreciation and amortization $ 30,864 $ 26,754 $ 18,474

Note 19 - Subsequent Events

Note 19 - Subsequent Events	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Subsequent Events [Text Block]	Note 19 None.

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Consolidation, Policy [Policy Text Block]	Principles of consolidation The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries, as listed within “Organization and business” above. All intercompany accounts and transactions have been eliminated in consolidation.
Comprehensive Income, Policy [Policy Text Block]	Comprehensive income Components of comprehensive income include net income and foreign currency translation adjustments. Comprehensive income is disclosed in the accompanying consolidated statements of comprehensive income and consolidated statements of shareholders’ equity.
Use of Estimates, Policy [Policy Text Block]	Accounting estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (U.S. GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and related disclosures at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and cash equivalents Cash and cash equivalents include cash and other investments, including marketable securities, with maturities of three may not
Marketable Securities, Policy [Policy Text Block]	Marketable securities Marketable securities include held-to-maturity debt securities recorded at amortized cost. Management determines the appropriate classification of debt securities at the time of purchase and reevaluates such designation as of each balance sheet date. Debt securities are classified as held-to-maturity when the Company has the positive intent and ability to hold the securities to maturity. Held-to-maturity securities are stated at amortized cost, adjusted for amortization of premiums and accretion of discounts to maturity computed under the effective interest method. Such amortization is included in other income, net. Interest on securities classified as held to maturity is included in other income, net. The classification of marketable securities as current or non-current is dependent upon the security’s maturity date. Securities with maturities of three 320, Investments – Debt and Equity Securities,
Accounts Receivable [Policy Text Block]	Accounts receivable and allowance for doubtful accounts Accounts receivable are reported at the invoiced amount less an allowance for doubtful accounts. As of each balance sheet date, the Company evaluates its accounts receivable and establishes an allowance for doubtful accounts based on a combination of specific customer circumstances and credit conditions taking into account the history of write-offs and collections. A receivable is considered past due if payment has not
Inventory, Policy [Policy Text Block]	Inventory 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
Property, Plant and Equipment, Policy [Policy Text Block]	Property, equipment and leasehold improvements Property, equipment and leasehold improvements are stated at cost. Major improvements that substantially extend an asset’s useful life are capitalized. Repairs, maintenance and minor improvements are charged to operations as incurred. Depreciation, including amortization of leasehold improvements and assets recorded under capital leases, is calculated using the straight-line method over the estimated useful lives of the individual assets and ranges from 3 to 39 years. Manufacturing equipment is depreciated over 3 to 15 years, office furniture and equipment are depreciated over 3 to 7 years, computer hardware and software are depreciated over 3 to 5 years, building costs are depreciated over 39 years, leasehold improvements are depreciated over the estimated lives of the related assets or the life of the lease, whichever is shorter, and building and land improvements are depreciated over 10 to 39 years. Assets not not The Company follows ASC 350 40, Internal-Use Software December 31, 2019 2018, December 31, 2019 $16.1
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Goodwill The Company recognizes goodwill in accordance with ASC 350, Intangibles—Goodwill and Other not fourth may
Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block]	Other Intangible Assets Other intangible assets include software technology, customer relationships and other intangible assets acquired from other independent parties. Other intangible assets with a definite life are amortized over a period ranging from two may not
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Accounting for long-lived assets The Company periodically reviews the carrying amount of its property, equipment and leasehold improvements to determine if circumstances exist indicating an impairment or if depreciation periods should be modified. If facts or circumstances indicate that an impairment may
Revenue [Policy Text Block]	Revenue recognition On January 1, 2018, 606, Revenue from Contracts with Customers, no two Prior to 2018, 3D
Lessee, Leases [Policy Text Block]	Leases On January 1, 2019, 842, Leases
Income Tax, Policy [Policy Text Block]	Income taxes The Company accounts for income taxes in accordance with ASC 740, Income Taxes 740 may not ASC 740 not 740
Compensation Related Costs, Policy [Policy Text Block]	Stock-based compensation The Company accounts for stock-based compensation in accordance with ASC 718, Compensation—Stock Compensation 718 718, not In determining the compensation cost of the options granted, the fair value of options granted has been estimated on the date of grant using the Black-Scholes option-pricing model.
Advertising Cost [Policy Text Block]	Advertising costs Advertising is expensed as incurred and was approximately $13.0 million, $11.8 million and $10.7 million for the years ended December 31, 2019, 2018 2017,
Research and Development Expense, Policy [Policy Text Block]	Research and development Research and development expenses consist primarily of personnel and outside service costs related to the development of new processes and product lines, enhancements of existing product lines, development of software for internal use, maintenance of internally developed software, quality assurance and testing. Costs for internal use software are evaluated by project and capitalized where appropriate under ASC 350 40, Intangibles - Goodwill and Other, Internal-Use Software December 31, 2019, 2018 2017,
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign currency translation/transactions The Company translated the balance sheets of its foreign subsidiaries at period-end exchange rates and the income statement at the average exchange rates in effect throughout the period. The Company has recorded the translation adjustment as a separate component of consolidated shareholders’ equity. Foreign currency transaction gains and losses are recognized in the consolidated statements of comprehensive income.
Business Combinations Policy [Policy Text Block]	Business combinations The Company accounts for business combinations in accordance with ASC 805, Business Combinations 805 November 30, 2017,
New Accounting Pronouncements, Policy [Policy Text Block]	Recently adopted accounting pronouncements During the fourth 2019, 2017 04, Intangibles – Goodwill and Other, no During the first 2019, 2016 02, Leases 842 2018 11, Leases 840, Leases 12 January 1, 2019 During the first 2018, 2014 09, Revenue from Contracts with Customers 606 no two January 1, 2018. During the first 2018, 2017 09, Compensation – Stock Compensation not Recently issued accounting pronouncements In December 2019, 2019 12, Income Taxes December 15, 2020 not In June 2016, 2016 13, Financial Instruments – Credit Losses, December 15, 2019 not

Note 3 - Revenue (Tables)

Note 3 - Revenue (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Disaggregation of Revenue [Table Text Block]	Year Ended December 31, (in thousands) 2019 2018 2017 Revenue: United States $ 360,205 $ 350,535 $ 263,086 Europe 82,805 80,889 70,154 Japan 15,718 14,172 11,250 Total revenue $ 458,728 $ 445,596 $ 344,490 Year Ended December 31, (in thousands) 2019 2018 2017 Revenue: Injection Molding $ 217,415 $ 210,523 $ 194,432 CNC Machining 155,473 153,521 103,739 3D Printing 61,352 53,342 43,329 Sheet Metal 21,000 24,998 1,767 Other Revenue 3,488 3,212 1,223 Total revenue $ 458,728 $ 445,596 $ 344,490

Note 4 - Net Income Per Commo_2

Note 4 - Net Income Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Year Ended December 31, (in thousands, except share and per share amounts) 2019 2018 2017 Net Income $ 63,655 $ 76,588 $ 51,778 Basic - weighted-average shares outstanding: 26,866,985 26,982,614 26,647,610 Effect of dilutive securities: Employee stock options and other 182,438 296,202 197,461 Diluted - weighted-average shares outstanding: 27,049,423 27,278,816 26,845,071 Net income per share attributable to common shareholders: Basic $ 2.37 $ 2.84 $ 1.94 Diluted $ 2.35 $ 2.81 $ 1.93

Note 5 - Business Combinations

Note 5 - Business Combinations (Tables) - Rapid [Member]	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	(in thousands) Assets acquired: Current assets $ 6,720 Goodwill 99,836 Other intangible assets 8,700 Other long-term assets 8,855 Total assets acquired 124,111 Liabilities assumed: Current liabilities 2,067 Other long-term liabilities 85 Total liabilities assumed 2,152 Net assets acquired $ 121,959 Cash paid $ 115,378 Cash acquired (4,755 ) Net cash consideration 110,623 Equity portion of purchase price 11,336 Total purchase consideration $ 121,959
Business Acquisition, Pro Forma Information [Table Text Block]	Year Ended December 31, (in thousands) 2017 2016 (unaudited) Revenue $ 386,677 $ 336,634 Net income 55,070 41,805

Note 6 - Goodwill and Other I_2

Note 6 - Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Goodwill [Table Text Block]	(in thousands) Dec. 31, 2017 Goodwill acquired during 2018 Dec. 31, 2018 Goodwill acquired during 2019 Dec. 31, 2019 United States $ 123,635 $ 248 $ 123,883 $ - $ 123,883 Europe 4,239 - 4,239 - 4,239 Japan 630 - 630 - 630 Total goodwill $ 128,504 $ 248 $ 128,752 $ - $ 128,752
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Year Ended December 31, 2019 Year Ended December 31, 2018 Weighted Average Useful Life (in thousands) Gross Accumulated Amortization Net Gross Accumulated Amortization Net Useful Life (in years) Remaining (in years) Intangible Assets with finite lives: Marketing assets $ 930 $ (527 ) $ 403 $ 930 $ (434 ) $ 496 10.0 4.3 Non-compete agreement 270 (222 ) 48 270 (206 ) 64 2.0 - 5.0 3.0 Trade secrets 250 (250 ) - 250 (233 ) 17 5.0 0.0 Trade names 1,080 (1,080 ) - 1,080 (540 ) 540 2.0 0.0 Software technology 13,229 (2,275 ) 10,954 12,229 (997 ) 11,232 10.0 8.0 Customer relationships 10,070 (4,106 ) 5,964 10,070 (2,569 ) 7,501 6.0 - 9.0 3.8 Total intangible assets $ 25,829 $ (8,460 ) $ 17,369 $ 24,829 $ (4,979 ) $ 19,850
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	(in thousands) Estimated Amortization Expense 2020 $ 3,016 2021 3,016 2022 3,016 2023 2,813 2024 1,400 Thereafter 4,108 Total estimated amortization expense $ 17,369

Note 7 - Fair Value Measureme_2

Note 7 - Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	December 31, 2019 December 31, 2018 (in thousands) Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Financial Assets: Cash and cash equivalents Money market mutual funds $ 68,962 $ - $ - $ 8,943 $ - $ - Total $ 68,962 $ - $ - $ 8,943 $ - $ -

Note 8 - Marketable Securities

Note 8 - Marketable Securities (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Debt Securities, Held-to-maturity [Table Text Block]	December 31, 2019 (in thousands) Amortized Cost Unrealized Gains Unrealized Losses Fair Value U.S. government agency securities $ 6,274 $ 1 $ (7 ) $ 6,268 Corporate debt securities 26,944 80 (12 ) 27,012 U.S. municipal securities 10,204 9 (3 ) 10,210 Commercial paper 3,491 - - 3,491 Certificates of deposit/time deposits 1,484 22 - 1,506 Total marketable securities $ 48,397 $ 112 $ (22 ) $ 48,487 December 31, 2018 (in thousands) Amortized Cost Unrealized Gains Unrealized Losses Fair Value U.S. government agency securities $ 16,843 $ - $ (88 ) $ 16,755 Corporate debt securities 31,769 - (96 ) 31,673 U.S. municipal securities 17,509 1 (33 ) 17,477 Certificates of deposit/time deposits 4,208 - (25 ) 4,183 Total marketable securities $ 70,329 $ 1 $ (242 ) $ 70,088
Investments Classified by Contractual Maturity Date [Table Text Block]	December 31, (in thousands) 2019 Due in one year or less $ 35,437 Due after one year through five years 12,960 Total marketable securities $ 48,397

Note 9 - Property and Equipme_2

Note 9 - Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Property, Plant and Equipment [Table Text Block]	December 31, (in thousands) 2019 2018 Land $ 14,098 $ 10,566 Buildings and improvements 75,843 72,819 Machinery and equipment 208,954 185,416 Computer hardware and software 24,953 22,323 Leasehold improvements 7,341 7,330 Construction in progress 54,313 25,279 Total 385,502 323,733 Accumulated depreciation and amortization (121,790 ) (95,732 ) Property and equipment, net $ 263,712 $ 228,001

Note 10 - Inventory (Tables)

Note 10 - Inventory (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Inventory, Current [Table Text Block]	December 31, (in thousands) 2019 2018 Raw materials $ 9,818 $ 9,560 Work in process 501 792 Total inventory 10,319 10,352 Allowance for obsolescence (244 ) (265 ) Inventory, net of allowance $ 10,075 $ 10,087

Note 13 - Stock-based Compens_2

Note 13 - Stock-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Share-based Payment Arrangement, Cost by Plan [Table Text Block]	Year Ended December 31, (in thousands) 2019 2018 2017 Stock options and other $ 9,591 $ 10,113 $ 7,954 Employee stock purchase plan 1,190 815 604 Total stock-based compensation expense $ 10,781 $ 10,928 $ 8,558 Cost of revenue $ 2,056 $ 1,543 $ 970 Operating expenses: Marketing and sales 2,632 1,942 1,429 Research and development 1,851 1,517 1,091 General and administrative 4,242 5,926 5,068 Total stock-based compensation expense $ 10,781 $ 10,928 $ 8,558
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Year Ended December 31, 2019 2018 2017 Risk-free interest rate 2.35 - 2.58% 2.52 - 3.07% 2.24 - 2.36% Expected life (years) 6.25 6.25 6.5 Expected volatility 42.52 - 42.74% 41.68 - 42.22% 42.68 - 44.68% Expected dividend yield 0% 0% 0% Weighted average grant date fair value $47.84 $50.08 $32.26
Share-based Payment Arrangement, Option, Activity [Table Text Block]	Weighted- Average Stock Options Exercise Price Options outstanding at January 1, 2017 569,639 $ 45.00 Granted 60,100 69.06 Exercised (187,313 ) 35.93 Cancelled (43,371 ) 61.02 Options outstanding at December 31, 2017 399,055 51.13 Granted 36,600 110.59 Exercised (155,765 ) 38.92 Cancelled (27,274 ) 74.35 Options outstanding at December 31, 2018 252,616 64.71 Granted 53,708 105.81 Exercised (16,079 ) 48.67 Cancelled (13,979 ) 89.50 Options outstanding at December 31, 2019 276,266 $ 72.38 Exercisable at December 31, 2019 152,423 $ 59.26
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]	Options Outstanding, Vested and Expected to Vest Options Exercisable Range of Exercise Prices Number Outstanding Weighted Average Remaining Contractual Life Weighted Average Exercise Price ($) Number Exercisable Weighted Average Exercise Price ($) 7.76 to 31.43 23,883 1.98 25.04 23,883 25.04 31.44 to 66.87 125,022 4.42 58.67 85,656 58.81 66.88 to 96.20 45,255 4.49 70.98 33,445 70.41 96.21 to 123.10 82,106 8.68 107.79 9,439 110.36
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]	Weighted- Average Grant Date Restricted Fair Value Stock Awards Per Share Restricted stock at January 1, 2017 215,105 $ 62.78 Granted 210,744 63.70 Restrictions lapsed (60,102 ) 63.60 Forfeited (30,916 ) 61.99 Restricted stock at December 31, 2017 334,831 63.29 Granted 106,855 115.41 Restrictions lapsed (86,191 ) 63.64 Forfeited (31,574 ) 68.67 Restricted stock at December 31, 2018 323,921 79.85 Granted 115,471 106.35 Restrictions lapsed (92,597 ) 77.25 Forfeited (31,822 ) 87.58 Restricted stock at December 31, 2019 314,973 $ 89.55
Schedule of Nonvested Performance-based Units Activity [Table Text Block]	Weighted- Average Grant Date Performance Fair Value Stock Awards Per Share Performance stock at January 1, 2017 - $ - Granted 25,707 58.35 Restrictions lapsed - - Forfeited - - 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 December 31, 2018 52,140 76.54 Granted 21,434 104.99 Restrictions lapsed - - Performance change (61,816 ) 88.06 Forfeited (2,375 ) 105.37 Performance stock at December 31, 2019 9,383 $ 58.35
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]	Year Ended December 31, 2019 2018 2017 Risk-free interest rate 1.59 - 2.35% 2.06 - 2.33% 0.97 - 1.48% Expected life (months) 6.00 6.00 6.00 Expected volatility 42.63 - 53.57% 31.50 - 37.36% 24.49 - 34.51% Expected dividend yield 0% 0% 0%

Note 14 - Leases (Tables)

Note 14 - Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Operating Lease Assets and Liabilities [Table Text Block]	(in thousands) December 31, 2019 Operating lease assets $ 11,425 Current operating lease liabilities $ 3,340 Long-term operating lease liabilities 8,565 Total operating lease liabilities $ 11,905
Schedule of Lease Expense [Table Text Block]	Three Months Ended Twelve Months Ended (in thousands) December 31, 2019 December 31, 2019 Operating lease cost $ 976 $ 3,960 Variable lease cost 228 1,039 Total lease cost $ 1,204 $ 4,999 Twelve Months Ended (in thousands) December 31, 2019 Cash paid for amounts included in the measurement of operating lease liabilities: Operating cash flows from operating leases $ 5,020 Lease assets obtained in exchange for new operating lease liabilities 1,921
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	(in thousands) Operating Leases Year Ending December 31, 2020 $ 4,034 2021 2,835 2022 2,634 2023 1,064 2024 498 After 2024 1,613 Total future minimum lease payments 12,678 Less interest (773 ) Present value of lease liabilities $ 11,905
Schedule of Lease Terms and Discount Rates [Table Text Block]	December 31, 2019 Weighted Average Remaining Lease Term (Years) 4.8 Weighted Average Discount Rate 2.6%

Note 15 - Accumulated Other C_2

Note 15 - Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Comprehensive Income (Loss) [Table Text Block]	Year Ended December 31, (in thousands) 2019 2018 2017 Foreign currency translation adjustments Balance at beginning of period $ (8,492 ) $ (5,234 ) $ (10,753 ) Other comprehensive (loss) income before reclassifications 1,474 (3,258 ) 5,519 Amounts reclassified from accumulated other comprehensive income (loss) - - - Net current-period other comprehensive (loss) income 1,474 (3,258 ) 5,519 Balance at end of period $ (7,018 ) $ (8,492 ) $ (5,234 )

Note 16 - Income Taxes (Tables)

Note 16 - Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]	Year Ended December 31, (in thousands) 2019 2018 2017 Domestic $ 74,841 $ 81,893 $ 69,929 Foreign 6,352 9,762 4,506 Total $ 81,193 $ 91,655 $ 74,435
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	Year Ended December 31, (in thousands) 2019 2018 2017 Current: Federal $ 6,991 $ (782 ) $ 17,808 State 2,882 2,078 1,367 Foreign 1,544 1,810 2,215 Deferred Federal 5,121 11,325 865 State 269 538 193 Foreign (809 ) (430 ) (1,918 ) Valuation Allowance 1,540 528 2,127 Total $ 17,538 $ 15,067 $ 22,657
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Year Ended December 31, 2019 2018 2017 Federal tax statutory rate 21.0 % 21.0 % 35.0 % State tax (net of federal benefit) 2.1 2.0 1.7 Share based compensation (0.5 ) (2.8 ) (0.8 ) Valuation allowance against deferred tax assets 1.4 0.7 2.9 Research and development credit (2.8 ) (2.5 ) (2.2 ) Foreign rate differential (0.3 ) (0.1 ) (1.9 ) Tax reserves 1.1 (0.1 ) 0.9 Domestic manufacturing deduction - - (2.5 ) Miscellaneous (0.4 ) (0.5 ) (0.2 ) Transition tax - (0.8 ) 3.2 Revaluation of deferred tax liability - (0.5 ) (5.7 ) Total 21.6 % 16.4 % 30.4 %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	December 31, (in thousands) 2019 2018 Deferred tax assets: Accrued expenses $ 1,362 $ 931 Leases 3,337 - Warrants and stock options 3,325 2,908 Intangible assets 1,171 748 Inventories 169 154 Other assets 1,765 666 Net operating loss 6,513 6,605 Less valuation allowance (8,248 ) (6,900 ) Total deferred tax assets 9,394 5,112 Deferred tax liabilities: Depreciation (26,750 ) (21,788 ) Goodwill (5,590 ) (3,486 ) Leases (3,337 ) - Total deferred tax liabilities (35,677 ) (25,274 ) Net deferred tax liability $ (26,283 ) $ (20,162 )
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	December 31, 2019 2018 Balance at beginning of period $ 4,096 $ 4,233 Additions for tax positions of current year 592 593 Additions for tax positions of prior years - 309 Decrease related to expiration of statutes of limitations (90 ) (1,039 ) Balance at period end $ 4,598 $ 4,096

Note 18 - Segment Reporting (Ta

Note 18 - Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Income from Operations by Geographic Area [Table Text Block]	Year Ended December 31, (in thousands) 2019 2018 2017 Income from Operations: United States $ 108,594 $ 115,710 $ 99,561 Europe 15,077 16,747 12,796 Corporate Unallocated and Japan (43,815 ) (43,557 ) (40,131 ) Total income from operations $ 79,856 $ 88,898 $ 72,226
Long-lived Assets by Geographic Areas [Table Text Block]	December 31, December 31, December 31, (in thousands) 2019 2018 2017 Long-lived assets: United States $ 210,171 $ 185,979 $ 125,308 Europe 45,019 34,577 33,691 Japan 8,522 7,445 7,441 Total long-lived assets $ 263,712 $ 228,001 $ 166,440
Expenditures for Additions to Long-lived Assets by Geographic Region [Table Text Block]	Year Ended December 31, (in thousands) 2019 2018 2017 Expenditures for additions to long-lived assets: United States $ 45,123 $ 78,762 $ 20,370 Europe 14,743 7,576 11,704 Japan 2,364 766 561 Total expenditures for additions to long-lived assets $ 62,230 $ 87,104 $ 32,635
Depreciation and Amortization by Geographic Region [Table Text Block]	Year Ended December 31, (in thousands) 2019 2018 2017 Depreciation and Amortization: United States $ 24,767 $ 21,117 $ 13,267 Europe 4,746 4,679 4,174 Japan 1,351 958 1,033 Total depreciation and amortization $ 30,864 $ 26,754 $ 18,474
Operating Segments [Member]
Notes Tables
Revenue from External Customers by Geographic Areas [Table Text Block]	Year Ended December 31, (in thousands) 2019 2018 2017 Revenue: United States $ 360,205 $ 350,535 $ 263,086 Europe 82,805 80,889 70,154 Japan 15,718 14,172 11,250 Total revenue $ 458,728 $ 445,596 $ 344,490

Note 2 - Summary of Significa_2

Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	Nov. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019	Jan. 01, 2018
Capitalized Computer Software, Net, Ending Balance		$ 32,700	$ 16,600
Advertising Expense		13,000	11,800	$ 10,700
Research and Development Expense, Total		32,692	28,735	23,560
Payments to Acquire Businesses, Net of Cash Acquired, Total		0	90	$ 110,533
Operating Lease, Right-of-Use Asset		11,425	0
Cumulative Effect of New Accounting Principle in Period of Adoption			1,462
Operating Lease, Liability, Total		$ 11,905
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 1,462
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset					$ 13,100
Operating Lease, Liability, Total					$ 13,100
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption						$ 1,500
Rapid [Member]
Business Combination, Consideration Transferred, Total	$ 121,959
Payments to Acquire Businesses, Net of Cash Acquired, Total	110,623
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 11,336
Building [Member]
Property, Plant and Equipment, Useful Life		39 years
Minimum [Member]
Property, Plant and Equipment, Useful Life		3 years
Finite-Lived Intangible Asset, Useful Life		2 years
Minimum [Member] | Equipment [Member]
Property, Plant and Equipment, Useful Life		3 years
Minimum [Member] | Office Furniture And Equipment [Member]
Property, Plant and Equipment, Useful Life		3 years
Minimum [Member] | Computer Equipment [Member]
Property, Plant and Equipment, Useful Life		3 years
Minimum [Member] | Land, Buildings and Improvements [Member]
Property, Plant and Equipment, Useful Life		10 years
Maximum [Member]
Property, Plant and Equipment, Useful Life		39 years
Finite-Lived Intangible Asset, Useful Life		10 years
Maximum [Member] | Equipment [Member]
Property, Plant and Equipment, Useful Life		15 years
Maximum [Member] | Office Furniture And Equipment [Member]
Property, Plant and Equipment, Useful Life		7 years
Maximum [Member] | Computer Equipment [Member]
Property, Plant and Equipment, Useful Life		5 years
Maximum [Member] | Land, Buildings and Improvements [Member]
Property, Plant and Equipment, Useful Life		39 years

Note 3 - Revenue (Details Textu

Note 3 - Revenue (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 1,462
Revenue from Contract with Customer, Including Assessed Tax	$ 458,728	445,596	$ 344,490
Cost of Goods and Services Sold, Total	223,438	206,917	150,648
Increase (Decrease) in Accounts Receivable	(1,848)	6,098	9,933
Increase (Decrease) in Inventories, Total	$ (60)	189	$ 985
Accounting Standards Update 2014-09 [Member]
Revenue from Contract with Customer, Including Assessed Tax		300
Cost of Goods and Services Sold, Total		200
Increase (Decrease) in Accounts Receivable		2,900
Increase (Decrease) in Inventories, Total		(1,300)
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 1,462
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ 1,500

Note 3 - Revenue - Disaggregati

Note 3 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue:
Revenue	$ 458,728	$ 445,596	$ 344,490
Injection Molding (Protomold) [Member]
Revenue:
Revenue	217,415	210,523	194,432
CNC Machining (Firstcut) [Member]
Revenue:
Revenue	155,473	153,521	103,739
3D Printing (Fineline) [Member]
Revenue:
Revenue	61,352	53,342	43,329
Sheet Metal [Member]
Revenue:
Revenue	21,000	24,998	1,767
Other Products [Member]
Revenue:
Revenue	3,488	3,212	1,223
UNITED STATES
Revenue:
Revenue	360,205	350,535	263,086
Europe [Member]
Revenue:
Revenue	82,805	80,889	70,154
JAPAN
Revenue:
Revenue	$ 15,718	$ 14,172	$ 11,250

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	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net income	$ 63,655	$ 76,588	$ 51,778
Basic - weighted-average shares outstanding: (in shares)	26,866,985	26,982,614	26,647,610
Employee stock options and other (in shares)	182,438	296,202	197,461
Diluted - weighted-average shares outstanding: (in shares)	27,049,423	27,278,816	26,845,071
Basic (in dollars per share)	$ 2.37	$ 2.84	$ 1.94
Diluted (in dollars per share)	$ 2.35	$ 2.81	$ 1.93

Note 5 - Business Combination_2

Note 5 - Business Combinations (Details Textual) - USD ($) $ in Thousands	Nov. 30, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Payments to Acquire Businesses, Net of Cash Acquired, Total			$ 0	$ 90	$ 110,533
Goodwill, Ending Balance		$ 128,504	128,752	128,752	128,504
Share-based Payment Arrangement, Noncash Expense, Total			$ 10,781	$ 10,928	8,558
Trade Names [Member]
Finite-Lived Intangible Asset, Useful Life			2 years
Rapid [Member]
Business Combination, Consideration Transferred, Total	$ 121,959
Payments to Acquire Businesses, Net of Cash Acquired, Total	110,623
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	11,336
Goodwill, Ending Balance	$ 99,836	99,600			99,600
Business Acquisition, Goodwill, Expected Tax Deductible Period	15 years
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years 6 months
Business Combination, Acquisition Related Costs					1,900
Business Acquisition, Increase (Decrease) in Depreciation Expense					(900)	$ (600)
Amortization, Total					$ 3,000	3,100
Share-based Payment Arrangement, Noncash Expense, Total						$ 200
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual		3,600
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		$ (700)
Rapid [Member] | Employees [Member]
Payments to Employees	$ 1,100
Rapid [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 7,500
Finite-Lived Intangible Asset, Useful Life	6 years
Rapid [Member] | Trade Names [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 1,100
Finite-Lived Intangible Asset, Useful Life	2 years
Rapid [Member] | Noncompete Agreements [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 100
Finite-Lived Intangible Asset, Useful Life	5 years

Note 5 - Business Combination_3

Note 5 - Business Combinations - Allocation of Purchase Price for the Acquisition of Rapid (Details) - USD ($) $ in Thousands	Nov. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets acquired:
Goodwill, Ending Balance		$ 128,752	$ 128,752	$ 128,504
Liabilities assumed:
Net cash consideration		$ 0	$ 90	110,533
Rapid [Member]
Assets acquired:
Current assets	$ 6,720
Goodwill, Ending Balance	99,836			$ 99,600
Other intangible assets	8,700
Other long-term assets	8,855
Total assets acquired	124,111
Liabilities assumed:
Current liabilities	2,067
Other long-term liabilities	85
Total liabilities assumed	2,152
Net assets acquired	121,959
Cash paid	115,378
Cash acquired	(4,755)
Net cash consideration	110,623
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	11,336
Total purchase consideration	$ 121,959

Note 5 - Business Combination_4

Note 5 - Business Combinations - Unaudited Pro Forma Information (Details) - Rapid [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Revenue	$ 386,677	$ 336,634
Net income	$ 55,070	$ 41,805

Note 6 - Goodwill and Other I_3

Note 6 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Nov. 30, 2017
Goodwill, Ending Balance	$ 128,752	$ 128,752	$ 128,504
Amortization of Intangible Assets, Total	3,500	3,200	500
Asset Acquisition, Contingent Consideration Arrangement Upon Completion of Milestone			$ 5,000
Asset Acquisitions, Contingent Consideration, Liability, Milestone Period			24 months
Asset Acquisitions, Contingent Consideration, Liability	$ 1,000	4,000
Rapid [Member]
Goodwill, Ending Balance			$ 99,600	$ 99,836
Business Combination, Working Capital Adjustment		$ 200
Finite-lived Intangible Assets Acquired			$ 8,200

Note 6 - Goodwill and Other I_4

Note 6 - Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill, balance as of the beginning of the period	$ 128,752	$ 128,504
Goodwill acquired during the period	0	248
Goodwill, balance as of the end of the period	128,752	128,752
UNITED STATES
Goodwill, balance as of the beginning of the period	123,883	123,635
Goodwill acquired during the period	0	248
Goodwill, balance as of the end of the period	123,883	123,883
Europe [Member]
Goodwill, balance as of the beginning of the period	4,239	4,239
Goodwill acquired during the period	0	0
Goodwill, balance as of the end of the period	4,239	4,239
JAPAN
Goodwill, balance as of the beginning of the period	630	630
Goodwill acquired during the period	0	0
Goodwill, balance as of the end of the period	$ 630	$ 630

Note 6 - Goodwill and Other I_5

Note 6 - Goodwill and Other Intangible Assets - Intangible Assets Other Than Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Gross	$ 25,829	$ 24,829
Accumulated Amortization	(8,460)	(4,979)
Net	$ 17,369	19,850
Minimum [Member]
Useful Life (Year)	2 years
Maximum [Member]
Useful Life (Year)	10 years
Marketing-Related Intangible Assets [Member]
Gross	$ 930	930
Accumulated Amortization	(527)	(434)
Net	$ 403	496
Useful Life (Year)	10 years
Weighted average useful life remaining (Year)	4 years 3 months 18 days
Noncompete Agreements [Member]
Gross	$ 270	270
Accumulated Amortization	(222)	(206)
Net	$ 48	64
Weighted average useful life remaining (Year)	3 years
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	(250)	(233)
Net	$ 0	17
Useful Life (Year)	5 years
Weighted average useful life remaining (Year)	0 years
Trade Names [Member]
Gross	$ 1,080	1,080
Accumulated Amortization	(1,080)	(540)
Net	$ 0	540
Useful Life (Year)	2 years
Weighted average useful life remaining (Year)	0 years
Computer Software, Intangible Asset [Member]
Gross	$ 13,229	12,229
Accumulated Amortization	(2,275)	(997)
Net	$ 10,954	11,232
Useful Life (Year)	10 years
Weighted average useful life remaining (Year)	8 years
Customer Relationships [Member]
Gross	$ 10,070	10,070
Accumulated Amortization	(4,106)	(2,569)
Net	$ 5,964	$ 7,501
Weighted average useful life remaining (Year)	3 years 9 months 18 days
Customer Relationships [Member] | Minimum [Member]
Useful Life (Year)	6 years
Customer Relationships [Member] | Maximum [Member]
Useful Life (Year)	9 years

Note 6 - Goodwill and Other I_6

Note 6 - Goodwill and Other Intangible Assets - Estimated Aggregated Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
2020	$ 3,016
2021	3,016
2022	3,016
2023	2,813
2024	1,400
Thereafter	4,108
Total estimated amortization expense	$ 17,369	$ 19,850

Note 7 - Fair Value Measureme_3

Note 7 - Fair Value Measurements - Fair Value of Financial Assets Measured on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Inputs, Level 1 [Member]
Money market mutual funds	$ 68,962	$ 8,943
Total	68,962	8,943
Fair Value, Inputs, Level 2 [Member]
Money market mutual funds	0	0
Total	0	0
Fair Value, Inputs, Level 3 [Member]
Money market mutual funds	0	0
Total	$ 0	$ 0

Note 8 - Marketable Securitie_2

Note 8 - Marketable Securities - Short-term and Long-term Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Amortized Cost	$ 48,397	$ 70,329
Unrealized Gains	112	1
Unrealized Losses	(22)	(242)
Fair Value	48,487	70,088
Bank Time Deposits [Member]
Amortized Cost	1,484	4,208
Unrealized Gains	22	0
Unrealized Losses	0	(25)
Fair Value	1,506	4,183
US Government Agencies Debt Securities [Member]
Amortized Cost	6,274	16,843
Unrealized Gains	1	0
Unrealized Losses	(7)	(88)
Fair Value	6,268	16,755
Corporate Debt Securities [Member]
Amortized Cost	26,944	31,769
Unrealized Gains	80	0
Unrealized Losses	(12)	(96)
Fair Value	27,012	31,673
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	10,204	17,509
Unrealized Gains	9	1
Unrealized Losses	(3)	(33)
Fair Value	10,210	$ 17,477
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Amortized Cost	3,491
Unrealized Gains	0
Unrealized Losses	0
Fair Value	$ 3,491

Note 8 - Marketable Securitie_3

Note 8 - Marketable Securities - Balance of Held-to-maturity Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Due in one year or less	$ 35,437
Due after one year through five years	12,960
Total marketable securities	$ 48,397	$ 70,329

Note 9 - Property and Equipme_3

Note 9 - Property and Equipment (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Depreciation, Total	$ 27.4	$ 23.5	$ 18

Note 9 - Property and Equipme_4

Note 9 - Property and Equipment - Components of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Land	$ 14,098	$ 10,566
Buildings and improvements	75,843	72,819
Machinery and equipment	208,954	185,416
Computer hardware and software	24,953	22,323
Leasehold improvements	7,341	7,330
Construction in progress	54,313	25,279
Total	385,502	323,733
Accumulated depreciation and amortization	(121,790)	(95,732)
Property and equipment, net	$ 263,712	$ 228,001	$ 166,440

Note 10 - Inventory - Inventory

Note 10 - Inventory - Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Raw materials	$ 9,818	$ 9,560
Work in process	501	792
Total inventory	10,319	10,352
Allowance for obsolescence	(244)	(265)
Inventory, net of allowance	$ 10,075	$ 10,087

Note 11 - Financing Obligatio_2

Note 11 - Financing Obligations (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Long-term Line of Credit, Total	$ 0	$ 0

Note 12 - Employee Benefit Pl_2

Note 12 - Employee Benefit Plans (Details Textual) - 401(k) Retirement Plan [Member] $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
UNITED STATES
Minimum Number Of Employee Working Hours Required To Be Eligible To Participate In 401K Plan	20
Minimum Service Period Of Employees To Avail Benefit Under Defined Contribution Benefit Plan	3 months
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	50.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 3.1	$ 2.7	$ 1.9
Foreign Plan [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 0.3	$ 0.3	$ 0.3

Note 13 - Stock-based Compens_3

Note 13 - Stock-based Compensation (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%	0.00%	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 0.9	$ 13	$ 7
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 8.6
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	3 years 7 months 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 6.5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	$ 1.5	$ 1.5	$ 2.8
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	6 months
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent	85.00%
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total	41,615	33,562
Employee Stock Purchase Plan, Weighted Average Purchase Price of Shares Purchased	86.70	85.61
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,168,830
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%	0.00%	0.00%
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 3.6
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years 7 months 6 days
Share-based Payment Arrangement, Option [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Payment Arrangement, Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years
Restricted Stock [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 21.1
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years 7 months 6 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
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 0.1
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 month 6 days
Percentage of Target Number Capable of Being Earned and Vesting, Lower Limit	0.00%
Percentage of Target Number Capable of Being Earned and Vesting, Upper Limit	150.00%

Note 13 - Stock-based Compens_4

Note 13 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allocated share-based compensation expense	$ 10,781	$ 10,928	$ 8,558
Cost of Sales [Member]
Allocated share-based compensation expense	2,056	1,543	970
Selling and Marketing Expense [Member]
Allocated share-based compensation expense	2,632	1,942	1,429
Research and Development Expense [Member]
Allocated share-based compensation expense	1,851	1,517	1,091
General and Administrative Expense [Member]
Allocated share-based compensation expense	4,242	5,926	5,068
Stock Options, Restricted Stock, and Other [Member]
Allocated share-based compensation expense	9,591	10,113	7,954
ESPP [Member]
Allocated share-based compensation expense	$ 1,190	$ 815	$ 604

Note 13 - Stock-based Compens_5

Note 13 - Stock-based Compensation - Assumptions Used in the Black-Scholes Option Pricing Model (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Expected life (Year)	6 years	6 years	6 years
Expected dividend yield	0.00%	0.00%	0.00%
Minimum [Member]
Risk-free interest rate	1.59%	2.06%	0.97%
Expected volatility	42.63%	31.50%	24.49%
Maximum [Member]
Risk-free interest rate	2.35%	2.33%	1.48%
Expected volatility	53.57%	37.36%	34.51%
Share-based Payment Arrangement, Option [Member]
Expected life (Year)	6 years 3 months	6 years 3 months	6 years 6 months
Expected dividend yield	0.00%	0.00%	0.00%
Weighted average grant date fair value (in dollars per share)	$ 47.84	$ 50.08	$ 32.26
Share-based Payment Arrangement, Option [Member] | Minimum [Member]
Risk-free interest rate	2.35%	2.52%	2.24%
Expected volatility	42.52%	41.68%	42.68%
Share-based Payment Arrangement, Option [Member] | Maximum [Member]
Risk-free interest rate	2.58%	3.07%	2.36%
Expected volatility	42.74%	42.22%	44.68%

Note 13 - Stock-based Compens_6

Note 13 - Stock-based Compensation - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Options outstanding (in shares)	252,616	399,055	569,639
Options outstanding, weighted-average exercise price (in dollars per share)	$ 64.71	$ 51.13	$ 45
Granted (in shares)	53,708	36,600	60,100
Granted, weighted-average exercise price (in dollars per share)	$ 105.81	$ 110.59	$ 69.06
Exercised (in shares)	(16,079)	(155,765)	(187,313)
Exercised, weighted-average exercise price (in dollars per share)	$ 48.67	$ 38.92	$ 35.93
Cancelled (in shares)	(13,979)	(27,274)	(43,371)
Cancelled, weighted-average exercise price (in dollars per share)	$ 89.50	$ 74.35	$ 61.02
Options outstanding (in shares)	276,266	252,616	399,055
Options outstanding, weighted-average exercise price (in dollars per share)	$ 72.38	$ 64.71	$ 51.13
Options exercisable (in shares)	152,423
Options exercisable, weighted-average exercise price (in dollars per share)	$ 59.26

Note 13 - Stock-based Compens_7

Note 13 - Stock-based Compensation - Information about Stock Options Outstanding (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Options outstanding, vested and expected to vest, number outstanding (in shares)	276,266	252,616	399,055	569,639
Options outstanding, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 72.38	$ 64.71	$ 51.13	$ 45
Exercise Price Range One [Member]
Range of exercise prices, lower limit (in dollars per share)	7.76
Range of exercise prices, upper limit (in dollars per share)	$ 31.43
Options outstanding, vested and expected to vest, number outstanding (in shares)	23,883
Options outstanding, vested and expected to vest, weighted average remaining contractual life (Year)	1 year 11 months 23 days
Options outstanding, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 25.04
Options exercisable, number exercisable (in shares)	23,883
Options exercisable, weighted average exercise price (in dollars per share)	$ 25.04
Exercise Price Range Two [Member]
Range of exercise prices, lower limit (in dollars per share)	31.44
Range of exercise prices, upper limit (in dollars per share)	$ 66.87
Options outstanding, vested and expected to vest, number outstanding (in shares)	125,022
Options outstanding, vested and expected to vest, weighted average remaining contractual life (Year)	4 years 5 months 1 day
Options outstanding, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 58.67
Options exercisable, number exercisable (in shares)	85,656
Options exercisable, weighted average exercise price (in dollars per share)	$ 58.81
Exercise Price Range Three [Member]
Range of exercise prices, lower limit (in dollars per share)	66.88
Range of exercise prices, upper limit (in dollars per share)	$ 96.20
Options outstanding, vested and expected to vest, number outstanding (in shares)	45,255
Options outstanding, vested and expected to vest, weighted average remaining contractual life (Year)	4 years 5 months 26 days
Options outstanding, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 70.98
Options exercisable, number exercisable (in shares)	33,445
Options exercisable, weighted average exercise price (in dollars per share)	$ 70.41
Exercise Price Range Four [Member]
Range of exercise prices, lower limit (in dollars per share)	96.21
Range of exercise prices, upper limit (in dollars per share)	$ 123.10
Options outstanding, vested and expected to vest, number outstanding (in shares)	82,106
Options outstanding, vested and expected to vest, weighted average remaining contractual life (Year)	8 years 8 months 4 days
Options outstanding, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 107.79
Options exercisable, number exercisable (in shares)	9,439
Options exercisable, weighted average exercise price (in dollars per share)	$ 110.36

Note 13 - Stock-based Compens_8

Note 13 - Stock-based Compensation - Restricted Stock Options (Details) - Restricted Stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted stock (in shares)	323,921	334,831	215,105
Restricted stock, weighted-average grant date fair value (in dollars per share)	$ 79.85	$ 63.29	$ 62.78
Granted (in shares)	115,471	106,855	210,744
Granted, weighted-average grant date fair value (in dollars per share)	$ 106.35	$ 115.41	$ 63.70
Restrictions lapsed (in shares)	(92,597)	(86,191)	(60,102)
Restrictions lapsed, weighted-average grant date fair value (in dollars per share)	$ 77.25	$ 63.64	$ 63.60
Forfeited (in shares)	(31,822)	(31,574)	(30,916)
Forfeited, weighted-average grant date fair value (in dollars per share)	$ 87.58	$ 68.67	$ 61.99
Restricted stock (in shares)	314,973	323,921	334,831
Restricted stock, weighted-average grant date fair value (in dollars per share)	$ 89.55	$ 79.85	$ 63.29

Note 13 - Stock-based Compens_9

Note 13 - Stock-based Compensation - Performance Stock (Details) - Performance Shares [Member] - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Performance stock (in shares)	52,140	25,707	0
Restricted stock, weighted-average grant date fair value (in dollars per share)	$ 76.54	$ 58.35	$ 0
Granted (in shares)	21,434	20,006	25,707
Granted, weighted-average grant date fair value (in dollars per share)	$ 104.99	$ 105.75	$ 58.35
Restrictions lapsed (in shares)	0	0	0
Restrictions lapsed, weighted-average grant date fair value (in dollars per share)	$ 0	$ 0	$ 0
Forfeited (in shares)	(2,375)	0	0
Forfeited, weighted-average grant date fair value (in dollars per share)	$ 105.37	$ 0	$ 0
Performance change (in shares)	(61,816)	6,427
Performance change, weighted-average grant date fair value (in dollars per share)	$ 88.06	$ 58.35
Performance stock (in shares)	9,383	52,140	25,707
Restricted stock, weighted-average grant date fair value (in dollars per share)	$ 58.35	$ 76.54	$ 58.35

Note 13 - Stock-based Compen_10

Note 13 - Stock-based Compensation - Assumptions Used to Estimate the Fair Value of the ESPP (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Expected life (months) (Year)	6 years	6 years	6 years
Expected dividend yield	0.00%	0.00%	0.00%
Minimum [Member]
Risk-free interest rate	1.59%	2.06%	0.97%
Expected volatility	42.63%	31.50%	24.49%
Maximum [Member]
Risk-free interest rate	2.35%	2.33%	1.48%
Expected volatility	53.57%	37.36%	34.51%

Note 14 - Leases (Details Textu

Note 14 - Leases (Details Textual) Pure in Thousands, $ in Thousands	Dec. 31, 2019USD ($)	Jan. 01, 2019USD ($)	Dec. 31, 2018USD ($)
Operating Lease, Right-of-Use Asset	$ 11,425		$ 0
Lessee, Financial Lease, Liability, Number of Leases	0
Lessee, Operating Lease, Lease Not yet Commenced, Number of Leases	0
Operating Lease, Liability, Total	$ 11,905
Minimum [Member] | Office Space, Manufacturing Facilities, and Certain Company Vehicles and Equipment [Member]
Lessee, Operating Lease, Term of Contract	1 year
Maximum [Member] | Office Space, Manufacturing Facilities, and Certain Company Vehicles and Equipment [Member]
Lessee, Operating Lease, Term of Contract	10 years
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset		$ 13,100
Operating Lease, Liability, Total		$ 13,100

Note 14 - Leases - Balance Shee

Note 14 - Leases - Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Operating lease assets	$ 11,425	$ 0
Current operating lease liabilities	3,340	0
Long-term operating lease liabilities	8,565	$ 0
Total operating lease liabilities	$ 11,905

Note 14 - Leases - Lease Expens

Note 14 - Leases - Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019
Operating lease cost	$ 976	$ 3,960
Variable lease cost	228	1,039
Total lease cost	$ 1,204	4,999
Operating cash flows from operating leases		5,020
Lease assets obtained in exchange for new operating lease liabilities		$ 1,921

Note 14 - Leases - Maturities o

Note 14 - Leases - Maturities of Operating Lease Liabilities (Details) $ in Thousands	Dec. 31, 2019USD ($)
2020	$ 4,034
2021	2,835
2022	2,634
2023	1,064
2024	498
After 2024	1,613
Total future minimum lease payments	12,678
Less interest	(773)
Present value of lease liabilities	$ 11,905

Note 14 - Leases - Weighted Ave

Note 14 - Leases - Weighted Average Remaining Terms and Discount Rates (Details)	Dec. 31, 2019
Weighted Average Remaining Lease Term (Years) (Year)	4 years 9 months 18 days
Weighted Average Discount Rate	2.60%

Note 15 - Accumulated Other C_3

Note 15 - Accumulated Other Comprehensive Loss - Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Balance	$ 541,497	$ 461,215	$ 379,833
Balance	585,790	541,497	461,215
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(8,492)	(5,234)	(10,753)
Other comprehensive (loss) income before reclassifications	1,474	(3,258)	5,519
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Net current-period other comprehensive (loss) income	1,474	(3,258)	5,519
Balance	$ (7,018)	$ (8,492)	$ (5,234)

Note 16 - Income Taxes (Details

Note 16 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Expense (Benefit), Total	$ 17,538	$ 15,067	$ 22,657
Effective Income Tax Rate Reconciliation, Percent, Total	21.60%	16.40%	30.40%
Effective Income Tax Rate Continuing Operations Increase (Decrease) During the Period	5.20%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	35.00%
Undistributed Earnings of Foreign Subsidiaries	$ 9,300
Operating Loss Carryforwards, Total	$ 6,500
Operating Loss Carryforwards, Expiration Period	10 years
Operating Loss Carryforwards, Percentage of Taxable Income	60.00%
Deferred Tax Assets, Valuation Allowance, Total	$ 8,248	$ 6,900
Unrecognized Tax Benefits, Ending Balance	$ 4,598	$ 4,096	$ 4,233

Note 16 - Income Taxes - Compon

Note 16 - Income Taxes - Components of Income (Loss) Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Domestic	$ 74,841	$ 81,893	$ 69,929
Foreign	6,352	9,762	4,506
Income before income taxes	$ 81,193	$ 91,655	$ 74,435

Note 16 - Income Taxes - Signif

Note 16 - Income Taxes - Significant Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ 6,991	$ (782)	$ 17,808
State	2,882	2,078	1,367
Foreign	1,544	1,810	2,215
Deferred
Federal	5,121	11,325	865
State	269	538	193
Foreign	(809)	(430)	(1,918)
Valuation Allowance	1,540	528	2,127
Total	$ 17,538	$ 15,067	$ 22,657

Note 16 - Income Taxes - Reconc

Note 16 - Income Taxes - Reconciliation of Federal Statutory Income Tax Rate to Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Federal tax statutory rate	21.00%	21.00%	35.00%
State tax (net of federal benefit)	2.10%	2.00%	1.70%
Share based compensation	(0.50%)	(2.80%)	(0.80%)
Valuation allowance against deferred tax assets	1.40%	0.70%	2.90%
Research and development credit	(2.80%)	(2.50%)	(2.20%)
Foreign rate differential	(0.30%)	(0.10%)	(1.90%)
Tax reserves	1.10%	(0.10%)	0.90%
Domestic manufacturing deduction	0.00%	0.00%	(2.50%)
Miscellaneous	(0.40%)	(0.50%)	(0.20%)
Transition tax	0.00%	(0.80%)	3.20%
Revaluation of deferred tax liability	0.00%	(0.50%)	(5.70%)
Total	21.60%	16.40%	30.40%

Note 16 - Income Taxes - Sign_2

Note 16 - Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Accrued expenses	$ 1,362	$ 931
Leases	3,337	0
Warrants and stock options	3,325	2,908
Intangible assets	1,171	748
Inventories	169	154
Other assets	1,765	666
Net operating loss	6,513	6,605
Less valuation allowance	(8,248)	(6,900)
Total deferred tax assets	9,394	5,112
Deferred tax liabilities:
Depreciation	(26,750)	(21,788)
Goodwill	(5,590)	(3,486)
Leases	(3,337)	0
Total deferred tax liabilities	(35,677)	(25,274)
Net deferred tax liability	$ (26,283)	$ (20,162)

Note 16 - Income Taxes - Reco_2

Note 16 - Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Balance	$ 4,096	$ 4,233
Additions for tax positions of current year	592	593
Additions for tax positions of prior years	0	309
Decrease related to expiration of statutes of limitations	(90)	(1,039)
Balance	$ 4,598	$ 4,096

Note 18 - Segment Reporting - R

Note 18 - Segment Reporting - Revenue From Operations by Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue	$ 458,728	$ 445,596	$ 344,490
Operating Segments [Member]
Revenue	458,728	445,596	344,490
Operating Segments [Member] | United States Segment [Member]
Revenue	360,205	350,535	263,086
Operating Segments [Member] | Europe Segment [Member]
Revenue	82,805	80,889	70,154
Operating Segments [Member] | Japan Segment [Member]
Revenue	$ 15,718	$ 14,172	$ 11,250

Note 18 - Segment Reporting - I

Note 18 - Segment Reporting - Income From Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income from operations	$ 79,856	$ 88,898	$ 72,226
Operating Segments [Member] | United States Segment [Member]
Income from operations	108,594	115,710	99,561
Operating Segments [Member] | Europe Segment [Member]
Income from operations	15,077	16,747	12,796
Operating Segments [Member] | Corporate Unallocated and Japan Segment[Member]
Income from operations	$ (43,815)	$ (43,557)	$ (40,131)

Note 18 - Segment Reporting - L

Note 18 - Segment Reporting - Long-lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Long-lived assets	$ 263,712	$ 228,001	$ 166,440
Operating Segments [Member] | United States Segment [Member]
Long-lived assets	210,171	185,979	125,308
Operating Segments [Member] | Europe Segment [Member]
Long-lived assets	45,019	34,577	33,691
Operating Segments [Member] | Japan Segment [Member]
Long-lived assets	$ 8,522	$ 7,445	$ 7,441

Note 18 - Segment Reporting - E

Note 18 - Segment Reporting - Expenditures for Additions to Long-lived Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Expenditures for additions to long-lived assets	$ 62,230	$ 87,104	$ 32,635
UNITED STATES
Expenditures for additions to long-lived assets	45,123	78,762	20,370
Europe [Member]
Expenditures for additions to long-lived assets	14,743	7,576	11,704
JAPAN
Expenditures for additions to long-lived assets	$ 2,364	$ 766	$ 561

Note 18 - Segment Reporting - D

Note 18 - Segment Reporting - Depreciation and Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Depreciation and amortization	$ 30,864	$ 26,754	$ 18,474
UNITED STATES
Depreciation and amortization	24,767	21,117	13,267
Europe [Member]
Depreciation and amortization	4,746	4,679	4,174
JAPAN
Depreciation and amortization	$ 1,351	$ 958	$ 1,033