Proto Labs (PRLB) 10-K 22 Feb 19 2018 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2018	Feb. 15, 2019	Jun. 30, 2018
Document Information [Line Items]
Entity Registrant Name	Proto Labs Inc
Entity Central Index Key	1,443,669
Trading Symbol	prlb
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding (in shares)		26,982,587
Entity Public Float			$ 3.2
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Shell Company	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 85,046	$ 36,707
Short-term marketable securities	46,750	57,424
Accounts receivable, net of allowance for doubtful accounts of $919 and $757 as of December 31, 2018 and December 31, 2017, respectively	59,155	51,503
Inventory	10,087	11,271
Prepaid expenses and other current assets	8,567	6,267
Income taxes receivable	5,757	1,832
Total current assets	215,362	165,004
Property and equipment, net	228,001	166,440
Goodwill	128,752	128,504
Other intangible assets, net	19,850	19,084
Long-term marketable securities	23,579	37,034
Other long-term assets	3,441	2,672
Total assets	618,985	518,738
Current liabilities
Accounts payable	17,411	15,876
Accrued compensation	18,130	12,100
Accrued liabilities and other	16,702	8,408
Short-term debt obligations		5,000
Income taxes payable	491	2,371
Total current liabilities	52,734	43,755
Long-term income taxes payable		2,181
Long-term deferred tax liabilities	20,162	6,966
Other long-term liabilities	4,592	4,621
Total liabilities	77,488	57,523
Shareholders' equity
Preferred stock, $0.001 par value, authorized 10,000,000 shares; issued and outstanding 0 shares as of December 31, 2018 and December 31, 2017, respectively
Common stock, $0.001 par value, authorized 150,000,000 shares; issued and outstanding 26,984,747 and 26,828,651 shares as of December 31, 2018 and December 31, 2017, respectively	27	27
Additional paid-in capital	258,502	241,725
Retained earnings	291,460	224,697
Accumulated other comprehensive loss	(8,492)	(5,234)
Total shareholders' equity	541,497	461,215
Total liabilities and shareholders' equity	$ 618,985	$ 518,738

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts	$ 919	$ 757
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	26,984,747	26,828,651
Common stock, shares outstanding (in shares)	26,984,747	26,828,651

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statements of Operations:
Revenue	$ 445,596	$ 344,490	$ 298,055
Cost of revenue	206,917	150,648	131,118
Gross profit	238,679	193,842	166,937
Operating expenses
Marketing and sales	68,533	56,856	46,131
Research and development	28,735	23,560	22,388
General and administrative	52,513	41,200	36,651
Total operating expenses	149,781	121,616	105,170
Income from operations	88,898	72,226	61,767
Other income, net	2,757	2,209	2,454
Income before income taxes	91,655	74,435	64,221
Provision for income taxes	15,067	22,657	21,514
Net income	$ 76,588	$ 51,778	$ 42,707
Net income per share:
Basic (in dollars per share)	$ 2.84	$ 1.94	$ 1.62
Diluted (in dollars per share)	$ 2.81	$ 1.93	$ 1.61
Shares used to compute net income per share:
Basic (in shares)	26,982,614	26,647,610	26,365,173
Diluted (in shares)	27,278,816	26,845,071	26,564,639
Other Comprehensive (Loss) Income, net of tax
Foreign currency translation adjustments	$ (3,258)	$ 5,519	$ (5,541)
Comprehensive income	$ 73,330	$ 57,297	$ 37,166

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Rapid [Member]Common Stock [Member]	Rapid [Member]Additional Paid-in Capital [Member]	Rapid [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2015				26,200,718
Balance at Dec. 31, 2015				$ 26	$ 198,835	$ 133,996	$ (5,212)	$ 327,645
Common shares issued on exercise of options and other (in shares)				304,150
Common shares issued on exercise of options and other					5,715			5,715
Excess tax benefit from stock option exercises					2,532			2,532
Stock-based compensation expense					6,775			6,775
Net income						42,707		42,707
Other Comprehensive (Loss) Income, net of tax
Foreign currency translation adjustments							(5,541)	(5,541)
Comprehensive income								37,166
Common shares issued on exercise of options and other (in shares)				304,150
Common shares issued on exercise of options and other					5,715			5,715
Stock-based compensation expense					6,775			6,775
Net income						42,707		42,707
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			8,604
Stock-based compensation expense					8,558			8,558
Net income						51,778		51,778
Other Comprehensive (Loss) Income, net of tax
Foreign currency translation adjustments							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			8,604
Common shares issued for RAPID acquisition (in shares)	118,140
Common shares issued for RAPID acquisition	$ 1	$ 11,335	$ 11,336
Stock-based compensation expense					8,558			8,558
Repurchases of Common Stock (in shares)				(77,806)
Repurchases of Common Stock				$ (1)	(628)	(3,784)		(4,413)
Net income						51,778		51,778
Repurchases of Common Stock				$ (1)	(628)	(3,784)		$ (4,413)
Balance (in shares) at Dec. 31, 2017				26,828,651				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					6,791			6,791
Stock-based compensation expense					10,928			10,928
Net income						76,588		76,588
Other Comprehensive (Loss) Income, net of tax
Foreign currency translation adjustments							(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					6,791			6,791
Stock-based compensation expense					10,928			10,928
Repurchases of Common Stock (in shares)				(104,598)
Repurchases of Common Stock					(942)	(11,287)		(12,229)
Net income						76,588		76,588
Repurchases of Common Stock					(942)	(11,287)		$ (12,229)
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						$ 1,462		$ 1,462

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities
Net income	$ 76,588	$ 51,778	$ 42,707
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	26,754	18,474	17,485
Share-based Compensation, Total	10,928	8,558	6,775
Deferred taxes	11,936	1,174	2,780
Loss on impairment of assets		513	455
Gain on sale of business	(671)
Amortization of held-to-maturity securities	374	1,063	1,173
Other	(619)	(153)	(1,541)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(6,098)	(9,933)	900
Inventories	(189)	(985)	136
Prepaid expenses and other	(2,098)	(691)	(1,312)
Income taxes	(6,652)	1,646	8,207
Accounts payable	1,942	3,176	(1,116)
Accrued liabilities and other	10,734	7,128	850
Net cash provided by operating activities	122,929	81,748	77,499
Investing activities
Purchases of property, equipment and other capital assets	(87,104)	(32,635)	(33,616)
Cash used for acquisitions, net of cash acquired	(90)	(110,533)
Proceeds from sale of business	284
Purchases of other assets and investments	(126)	(8,742)
Purchases of marketable securities	(41,384)	(20,037)	(89,315)
Proceeds from maturities of marketable securities	65,139	47,972	62,176
Net cash used in investing activities	(63,281)	(123,975)	(60,755)
Financing activities
Payments on debt	(5,000)
Proceeds from issuance of debt		5,000
Acquisition-related contingent consideration			(400)
Repurchases of common stock	(12,229)	(4,410)
Proceeds from exercises of stock options and other	6,791	8,602	5,715
Net cash (used in) provided by financing activities	(10,438)	9,192	5,315
Effect of exchange rate changes on cash and cash equivalents	(871)	947	(917)
Net increase (decrease) in cash and cash equivalents	48,339	(32,088)	21,142
Cash and cash equivalents, beginning of period	36,707	68,795	47,653
Cash and cash equivalents, end of period	85,046	36,707	68,795
Supplemental cash flow disclosure
Cash paid for interest	39	19	1
Cash paid for taxes	$ 9,966	$ 19,113	$ 9,802

Note 1 - Nature of Business

Note 1 - Nature of Business	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Nature of Operations [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 Manufacturing Group LLC United States Proto Labs Ltd. United Kingdom PL Euro Services Ltd. United Kingdom PL International Holdings, UK, Ltd. United Kingdom PL DE Holding GmbH Germany Proto Labs GmbH Germany Proto Labs Eschenlohe GmbH Germany Proto Labs, G.K. Japan

Note 2 - Summary of Significant

Note 2 - Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
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 39 3 15 3 7 3 5 39 10 39 not not The Company follows ASC 350 40, Internal-Use Software December 31, 2018 2017, $16.6 $4.9 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 10 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 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 $11.8 $10.7 $10.5 December 31, 2018, 2017 2016, Research and development Research and development expenses consist primarily of personnel and outside service costs related to the creation of and enhancements to our customer-facing and internal operating software systems, development of new processes and product lines, enhancement of existing product lines, quality assurance and testing. Research and development costs were approximately $28.7 $23.6 $22.4 December 31, 2018, 2017 2016, 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, $121.9 $110.6 $11.3 Recently adopted accounting pronouncements During the first 2018, 2014 09, Revenue from Contracts with Customers 606 no two $1.5 January 1, 2018. During the first 2018, 2017 09, Compensation – Stock Compensation not Recently issued accounting pronouncements In February 2016, 2016 02, Leases December 15, 2018 January 1, 2019 2018 11, Leases, 840, Leases, 12 January 1, 2019 $14.0 In January 2017, 2017 04, Intangibles – Goodwill and Other, December 15, 2019 not In June 2016, 2016 13, Financial Instruments – Credit Losses, December 15, 2020 not

Note 3 - Revenue

Note 3 - Revenue	12 Months Ended
	Dec. 31, 2018
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. $1.5 January 1, 2018 606. 606 $0.3 $0.2 December 31, 2018, $2.9 $1.3 December 31, 2018, $1.5 A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account in ASC 606. 3D one second The Company manufactures parts that have no two Revenue by geographic region for the years ended December 31, 2018, 2017 2016 Year Ended December 31, (in thousands) 2018 2017 2016 Revenue: United States $ 350,535 $ 263,086 $ 223,930 Europe 80,889 70,154 63,365 Japan 14,172 11,250 10,760 Total revenue $ 445,596 $ 344,490 $ 298,055 Revenue by product line for the years ended December 31, 2018, 2017 2016 Year Ended December 31, (in thousands) 2018 2017 2016 Revenue: Injection Molding $ 210,523 $ 194,432 $ 175,974 CNC Machining 153,521 103,739 81,407 3D Printing 53,342 43,329 37,847 Sheet Metal 24,998 1,767 - Other Revenue 3,212 1,223 2,827 Total revenue $ 445,596 $ 344,490 $ 298,055 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, 2018
Notes to Financial Statements
Earnings Per Share [Text Block]	Note 4 – Net Income Per Common Share 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) 2018 2017 2016 Net Income $ 76,588 $ 51,778 $ 42,707 Basic - weighted-average shares outstanding: 26,982,614 26,647,610 26,365,173 Effect of dilutive securities: Employee stock options and other 296,202 197,461 199,466 Diluted - weighted-average shares outstanding: 27,278,816 26,845,071 26,564,639 Net income per share attributable to common shareholders: Basic $ 2.84 $ 1.94 $ 1.62 Diluted $ 2.81 $ 1.93 $ 1.61

Note 5 - Business Combinations

Note 5 - Business Combinations	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Business Combination Disclosure [Text Block]	Note 5 – Business Combinations On November 30, 2017, $121.9 $110.6 $11.3 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. $99.8 15 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 $7.5 6.0 $1.1 2.0 $0.1 5 (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 $1.9 $0.9 $3.0 December 31, 2016 $0.2 $0.6 $3.1 December 31, 2017 2016 may not not January 1, 2016. 2017 $3.6 $0.7 $1.1

Note 6 - Goodwill and Other Int

Note 6 - Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	Note 6 – Goodwill and Other Intangible Assets The changes in the carrying amount of goodwill for the years ended December 31, 2018 2017 (in thousands) Dec. 31, 2016 Goodwill acquired during 2017 Dec. 31, 2017 Goodwill acquired during 2018 Dec. 31, 2018 United States $ 24,047 $ 99,588 $ 123,635 $ 248 $ 123,883 Europe 4,239 - 4,239 - 4,239 Japan 630 - 630 - 630 Total goodwill $ 28,916 $ 99,588 $ 128,504 $ 248 $ 128,752 As described in Note 5 November 2017. $99.6 December 31, 2017 $0.2 December 31, 2018. Intangible assets other than goodwill for the years ended December 31, 2018 2017 Year Ended December 31, 2018 Year Ended December 31, 2017 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 $ (434 ) $ 496 $ 930 $ (341 ) $ 589 10.0 5.3 Non-compete agreement 270 (206 ) 64 270 (190 ) 80 2.0 - 5.0 4.0 Trade secrets 250 (233 ) 17 250 (183 ) 67 5.0 0.3 Trade names 1,080 (540 ) 540 1,080 - 1,080 2.0 1.0 Software technology 12,229 (997 ) 11,232 8,229 - 8,229 10.0 9.0 Customer relationships 10,070 (2,569 ) 7,501 10,070 (1,031 ) 9,039 6.0 - 9.0 4.8 Total intangible assets $ 24,829 $ (4,979 ) $ 19,850 $ 20,829 $ (1,745 ) $ 19,084 Amortization expense for intangible assets for the years ended December 31, 2018, 2017 2016 $3.2 $0.5 $0.7 The Company acquired a software company in December 2017, $8.2 December 31, 2017. not 805. $5.0 24 $4.0 December 31, 2018. not December 31, 2017 not Estimated aggregated amortization expense based on the current carrying value of the amortizable intangible assets is as follows: (in thousands) Estimated Amortization Expense 2019 $ 3,451 2020 2,895 2021 2,895 2022 2,895 2023 2,691 Thereafter 5,023 Total estimated amortization expense $ 19,850

Note 7 - Fair Value Measurement

Note 7 - Fair Value Measurements	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Fair Value Disclosures [Text Block]	Note 7 – Fair Value Measurements 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, 2018 2017, 1 The following tables summarizes financial assets as of December 31, 2018 2017 December 31, 2018 December 31, 2017 (in thousands) Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Financial Assets: Cash and cash equivalents Money market mutual funds $ 8,943 $ - $ - $ 3,034 $ - $ - Total $ 8,943 $ - $ - $ 3,034 $ - $ -

Note 8 - Marketable Securities

Note 8 - Marketable Securities	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Investment [Text Block]	Note 8 – Marketable Securities 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, 2018 2017 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 December 31, 2017 (in thousands) Amortized Cost Unrealized Gains Unrealized Losses Fair Value U.S. government agency securities $ 32,320 $ - $ (199 ) $ 32,121 Corporate debt securities 29,806 - (128 ) 29,678 U.S. municipal securities 28,364 - (104 ) 28,260 Certificates of deposit/time deposits 3,968 - (32 ) 3,936 Total marketable securities $ 94,458 $ - $ (463 ) $ 93,995 Fair values for the corporate debt securities are primarily determined based on quoted market prices (Level 1 2 The Company tests for other than temporary losses on a quarterly basis and has considered the unrealized losses indicated above to be temporary in nature. 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, 2018 may may December 31, (in thousands) 2018 Due in one year or less $ 46,750 Due after one year through five years 23,579 Total marketable securities $ 70,329

Note 9 - Property and Equipment

Note 9 - Property and Equipment	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	Note 9 – Property and Equipment Property and equipment consists of the following: December 31, (in thousands) 2018 2017 Land $ 10,566 $ 8,910 Buildings and improvements 72,819 49,921 Machinery and equipment 185,416 148,535 Computer hardware and software 22,323 17,634 Leasehold improvements 7,330 6,634 Construction in progress 25,279 8,988 Total 323,733 240,622 Accumulated depreciation and amortization (95,732 ) (74,182 ) Property and equipment, net $ 228,001 $ 166,440 Depreciation expense for the years ended December 31, 2018, 2017 2016 $23.5 $18.0 $16.8

Note 10 - Inventory

Note 10 - Inventory	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Inventory Disclosure [Text Block]	Note 10 – 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 The Company’s inventory consists of the following: December 31, (in thousands) 2018 2017 Raw materials $ 9,560 $ 9,767 Work in process 792 1,998 Total inventory 10,352 11,765 Allowance for obsolescence (265 ) (494 ) Inventory, net of allowance $ 10,087 $ 11,271

Note 11 - Financing Obligations

Note 11 - Financing Obligations	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Debt Disclosure [Text Block]	Note 1 1 – Financing Obligations The Company’s debt consists of the following: December 31, (in thousands) 2018 2017 Revolving Credit Facility, with interest rates from 2.50% to 2.59%, due at maturity in November 2019 $ - $ 5,000 Total Financing Obligations $ - $ 5,000 The Company entered into a Credit Agreement (the “Credit Agreement”) with Wells Fargo Bank, National Association, as lender on November 27, 2017. $30.0 $5.0 November 30, 2019, one 1%, two six 1%. 0.15%.

Note 12 - Employee Benefit Plan

Note 12 - Employee Benefit Plans	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Pension and Other Postretirement Benefits Disclosure [Text Block]	Note 1 2 – Employee Benefit Plans The Company maintains a 401 20 three may 50 may may $2.7 $1.9 $1.6 December 31, 2018, 2017 2016, The Company also sponsors a defined contribution retirement plan that covers the employees in the United Kingdom. Total employer contributions were approximately $0.3 $0.3 $0.2 December 31, 2018, 2017 2016,

Note 13 - Stock-based Compensat

Note 13 - Stock-based Compensation	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	Note 1 3 – Stock-Based Compensation 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 15 six 85 first 718 Employees purchased 33,562 41,307 $85.61 $48.91 2018 2017, December 31, 2018, 1,210,445 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, 2018, 2017 2016, Year Ended December 31, (in thousands) 2018 2017 2016 Stock options and other $ 10,113 $ 7,954 $ 6,177 Employee stock purchase plan 815 604 598 Total stock-based compensation expense $ 10,928 $ 8,558 $ 6,775 Cost of revenue $ 1,543 $ 970 $ 691 Operating expenses: Marketing and sales 1,942 1,429 977 Research and development 1,517 1,091 1,396 General and administrative 5,926 5,068 3,711 Total stock-based compensation expense $ 10,928 $ 8,558 $ 6,775 Stock Options The following table provides the assumptions used in the Black-Scholes option pricing model for the years ended December 31, 2018, 2017 2016: Year Ended December 31, 2018 2017 2016 Risk-free interest rate 2.52 - 3.07% 2.24 - 2.36% 1.53 - 2.68% Expected life (years) 6.25 6.50 6.50 Expected volatility 41.68 - 42.22% 42.68 - 44.68% 44.38 - 45.93% Expected dividend yield 0% 0% 0% Weighted average grant date fair value $50.08 $32.26 $26.61 The following table summarizes stock option activity and the weighted average exercise price for the years ended December 31, 2018, 2017 2016: Weighted- Average Stock Options Exercise Price Options outstanding at January 1, 2016 766,042 $ 36.52 Granted 117,480 57.99 Exercised (226,164 ) 16.65 Cancelled (87,719 ) 61.41 Options outstanding at December 31, 2016 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 Exercisable at December 31, 2018 125,925 $ 53.02 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, 2018, 2017 2016, $13.0 $7.0 $11.1 For options outstanding at December 31, 2018, 5.7 $12.2 December 31, 2018, 3.5 $7.5 The following table summarizes information about stock options outstanding at December 31, 2018: Options Outstanding, Vested and Expected to Vest Options Exercisable Range of Exercise Prices Number Outstanding Weighted Weighted Average Exercise Price ($) Number Exercisable Weighted Average Exercise Price ($) $3.67 to $31.43 30,972 2.95 24.59 30,972 24.59 $31.44 to $66.87 133,492 5.36 58.52 69,210 58.78 $66.88 to $96.20 51,894 5.55 72.49 25,743 71.73 $96.21 to $123.10 36,258 9.23 110.59 0 0.00 The fair value of share-based payment transactions is recognized in the consolidated statements of comprehensive income. As of December 31, 2018, $3.3 2.8 $1.5 $2.8 $3.6 December 31, 2018, 2017 2016, Restricted Stock The 2012 four five first first The following table summarizes restricted stock activity for the years ended December 31, 2018, 2017 2016: Weighted- Average Grant Date Restricted Fair Value Stock Awards Per Share Restricted stock at January 1, 2016 124,393 $ 68.97 Granted 161,555 59.37 Restrictions lapsed (41,415 ) 67.78 Forfeited (29,428 ) 63.23 Restricted stock at December 31, 2016 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 As of December 31, 2018, $20.7 3.1 Performance Stock Performance Stock Units (PSUs) are expressed in terms of a target number of PSUs, with anywhere between 0 150 three The following table summarizes performance stock activity for the years ended December 31, 2018, 2017 2016: Weighted- Average Grant Date Performance Fair Value Stock Awards Per Share Performance stock at January 1, 2016 - $ - Granted - - Restrictions lapsed - - Forfeited - - Performance stock at December 31, 2016 - - 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 assumption change 6,427 58.35 Forfeited - - Performance stock at December 31, 2018 52,140 $ 76.54 As of December 31, 2018, $2.2 1.8 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, 2018, 2017 2016: Year ended December 31, 2018 2017 2016 Risk-free interest rate 2.06 - 2.33% 0.97 - 1.48% 0.56 - 0.59% Expected life (months) 6.00 6.00 6.00 Expected volatility 31.50 - 37.36% 24.49 - 34.51% 39.51 - 49.13% Expected dividend yield 0% 0% 0%

Note 14 - Commitments

Note 14 - Commitments	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	Note 1 4 – Commitments The Company leases property from third three 2019 2022. 2019 2025. April 2023. 2019 2028. Future minimum commitments under non-cancelable leases at December 31, 2018, Operating Leases (in thousands) Years Ending December 31, 2019 $ 3,411 2020 2,612 2021 2,266 2022 2,211 2023 975 After 2023 2,142 Total future minimum lease payments $ 13,617 Rental expense was approximately $4.2 $3.0 $3.6 December 31, 2018, 2017 2016,

Note 15 - Accumulated Other Com

Note 15 - Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Disclosure of Reclassification Amount [Text Block]	Note 1 5 – Accumulated Other Comprehensive Loss 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, 2018, 2017 2016, Year Ended December 31, (in thousands) 2018 2017 2016 Foreign currency translation adjustments Balance at beginning of period $ (5,234 ) $ (10,753 ) $ (5,212 ) Other comprehensive (loss) income before reclassifications (3,258 ) 5,519 (5,541 ) Amounts reclassified from accumulated other comprehensive income (loss) - - - Net current-period other comprehensive (loss) income (3,258 ) 5,519 (5,541 ) Balance at end of period $ (8,492 ) $ (5,234 ) $ (10,753 )

Note 16 - Income Taxes

Note 16 - Income Taxes	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Income Tax Disclosure [Text Block]	Note 1 6 – Income Taxes 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, 2018, 2017 2016, $15.1 $22.7 $21.5 December 31, 2018, 2017 2016 16.4 30.4 33.4 The effective tax rate decreased by 14.0% December 31, 2018 2017 December 22, 2017. 35% 21%, December 31, 2017, not $2.4 $4.2 2017. December 31, 2018, $0.7 $0.5 $3.0 1986 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) 2018 2017 2016 Domestic $ 81,893 $ 69,929 $ 59,232 Foreign 9,762 4,506 4,989 Total $ 91,655 $ 74,435 $ 64,221 Significant components of the provision for income taxes for the following periods are as follows: Year Ended December 31, (in thousands) 2018 2017 2016 Current: Federal $ (782 ) $ 17,808 $ 15,119 State 2,078 1,367 1,091 Foreign 1,810 2,215 2,439 Deferred Federal 11,325 865 2,758 State 538 193 75 Foreign (430 ) (1,918 ) (1,960 ) Valuation Allowance 528 2,127 1,992 Total $ 15,067 $ 22,657 $ 21,514 A reconciliation of the federal statutory income tax rate to the effective tax rate is as follows: Year Ended December 31, 2018 2017 2016 Federal tax statutory rate 21.0 % 35.0 % 35.0 % State tax (net of federal benefit) 2.0 1.7 0.6 Share based compensation (2.8 ) (0.8 ) - Valuation allowance against deferred tax assets 0.7 2.9 3.1 Research and development credit (2.5 ) (2.2 ) (2.2 ) Foreign rate differential (0.1 ) (1.9 ) (2.8 ) Tax reserves (0.1 ) 0.9 1.4 Domestic manufacturing deduction - (2.5 ) (1.8 ) Other (0.5 ) (0.2 ) 0.1 Transition tax (0.8 ) 3.2 - Revaluation of deferred tax liability (0.5 ) (5.7 ) 0.0 Total 16.4 % 30.4 % 33.4 % Significant components of deferred tax assets and liabilities are as follows: December 31, (in thousands) 2018 2017 Deferred tax assets: Accrued expenses $ 931 $ 756 Stock options, restricted stock and other 2,908 2,309 Intangible assets 748 429 Inventories 154 220 Other assets 666 625 Net operating loss 6,605 6,374 Less valuation allowance (6,900 ) (6,633 ) Total deferred tax assets 5,112 4,080 Deferred tax liabilities: Depreciation (21,788 ) (9,528 ) Goodwill (3,486 ) (1,518 ) Total deferred tax liabilities (25,274 ) (11,046 ) Net deferred tax liability $ (20,162 ) $ (6,966 ) The Company has recorded no December 31, 2018. not December 31, 2018, $6.8 As of December 31, 2018, $22.5 ten 50 may €1 50 €1 2019 2026. 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 $6.9 $6.6 December 31, 2018 2017, 2018. 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 2015. The Company has liabilities related to unrecognized tax benefits totaling $4.1 $4.2 December 31, 2018 2017, not twelve December 31, 2018, 2017 2016. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: December 31, 2018 2017 Balance at beginning of period $ 4,233 $ 3,796 Additions for tax positions of current year 593 831 Additions for tax positions of prior years 309 48 Decrease related to expiration of statutes of limitations (1,039 ) (442 ) Balance at period end $ 4,096 $ 4,233

Note 17 - Litigation

Note 17 - Litigation	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Legal Matters and Contingencies [Text Block]	Note 1 7 – Litigation From time to time, the Company may not

Note 18 - Segment Reporting

Note 18 - Segment Reporting	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	Note 1 8 – Segment Reporting 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 Revenue and income from operations by reportable segment are as follows: Year Ended December 31, (in thousands) 2018 2017 2016 Revenue: United States $ 350,535 $ 263,086 $ 223,930 Europe 80,889 70,154 63,365 Japan 14,172 11,250 10,760 Total revenue $ 445,596 $ 344,490 $ 298,055 Year Ended December 31, (in thousands) 2018 2017 2016 Income from Operations: United States $ 120,641 $ 103,136 $ 89,308 Europe 16,804 12,846 11,657 Corporate Unallocated and Japan (48,547 ) (43,756 ) (39,198 ) Total income from operations $ 88,898 $ 72,226 $ 61,767 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) 2018 2017 2016 Long-lived assets: United States $ 185,979 $ 125,308 $ 108,650 Europe 34,577 33,691 23,199 Japan 7,445 7,441 7,625 Total long-lived assets $ 228,001 $ 166,440 $ 139,474 Year Ended December 31, (in thousands) 2018 2017 2016 Expenditures for additions to long-lived assets: United States $ 78,762 $ 20,370 $ 21,190 Europe 7,576 11,704 5,954 Japan 766 561 6,472 Total expenditures for additions to long-lived assets $ 87,104 $ 32,635 $ 33,616 Year Ended December 31, (in thousands) 2018 2017 2016 Depreciation and Amortization: United States $ 21,117 $ 13,267 $ 12,533 Europe 4,679 4,174 3,386 Japan 958 1,033 1,566 Total depreciation and amortization $ 26,754 $ 18,474 $ 17,485

Note 19 - Subsequent Events

Note 19 - Subsequent Events	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Subsequent Events [Text Block]	Note 1 9 – Subsequent Events None.

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
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,
Trade and Other Accounts Receivable, Policy [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 39 3 15 3 7 3 5 39 10 39 not not The Company follows ASC 350 40, Internal-Use Software December 31, 2018 2017, $16.6 $4.9
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 10 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 Recognition, Policy [Policy Text Block]	Revenue recognition On January 1, 2018, 606, Revenue from Contracts with Customers, no two Prior to 2018, 3D
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 Costs, Policy [Policy Text Block]	Advertising costs Advertising is expensed as incurred and was approximately $11.8 $10.7 $10.5 December 31, 2018, 2017 2016,
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 creation of and enhancements to our customer-facing and internal operating software systems, development of new processes and product lines, enhancement of existing product lines, quality assurance and testing. Research and development costs were approximately $28.7 $23.6 $22.4 December 31, 2018, 2017 2016,
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, $121.9 $110.6 $11.3
New Accounting Pronouncements, Policy [Policy Text Block]	Recently adopted accounting pronouncements During the first 2018, 2014 09, Revenue from Contracts with Customers 606 no two $1.5 January 1, 2018. During the first 2018, 2017 09, Compensation – Stock Compensation not Recently issued accounting pronouncements In February 2016, 2016 02, Leases December 15, 2018 January 1, 2019 2018 11, Leases, 840, Leases, 12 January 1, 2019 $14.0 In January 2017, 2017 04, Intangibles – Goodwill and Other, December 15, 2019 not In June 2016, 2016 13, Financial Instruments – Credit Losses, December 15, 2020 not

Note 3 - Revenue (Tables)

Note 3 - Revenue (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Disaggregation of Revenue [Table Text Block]	Year Ended December 31, (in thousands) 2018 2017 2016 Revenue: United States $ 350,535 $ 263,086 $ 223,930 Europe 80,889 70,154 63,365 Japan 14,172 11,250 10,760 Total revenue $ 445,596 $ 344,490 $ 298,055 Year Ended December 31, (in thousands) 2018 2017 2016 Revenue: Injection Molding $ 210,523 $ 194,432 $ 175,974 CNC Machining 153,521 103,739 81,407 3D Printing 53,342 43,329 37,847 Sheet Metal 24,998 1,767 - Other Revenue 3,212 1,223 2,827 Total revenue $ 445,596 $ 344,490 $ 298,055

Note 4 - Net Income Per Commo_2

Note 4 - Net Income Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2018
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) 2018 2017 2016 Net Income $ 76,588 $ 51,778 $ 42,707 Basic - weighted-average shares outstanding: 26,982,614 26,647,610 26,365,173 Effect of dilutive securities: Employee stock options and other 296,202 197,461 199,466 Diluted - weighted-average shares outstanding: 27,278,816 26,845,071 26,564,639 Net income per share attributable to common shareholders: Basic $ 2.84 $ 1.94 $ 1.62 Diluted $ 2.81 $ 1.93 $ 1.61

Note 5 - Business Combinations

Note 5 - Business Combinations (Tables) - Rapid [Member]	12 Months Ended
	Dec. 31, 2018
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, 2018
Notes Tables
Schedule of Goodwill [Table Text Block]	(in thousands) Dec. 31, 2016 Goodwill acquired during 2017 Dec. 31, 2017 Goodwill acquired during 2018 Dec. 31, 2018 United States $ 24,047 $ 99,588 $ 123,635 $ 248 $ 123,883 Europe 4,239 - 4,239 - 4,239 Japan 630 - 630 - 630 Total goodwill $ 28,916 $ 99,588 $ 128,504 $ 248 $ 128,752
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Year Ended December 31, 2018 Year Ended December 31, 2017 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 $ (434 ) $ 496 $ 930 $ (341 ) $ 589 10.0 5.3 Non-compete agreement 270 (206 ) 64 270 (190 ) 80 2.0 - 5.0 4.0 Trade secrets 250 (233 ) 17 250 (183 ) 67 5.0 0.3 Trade names 1,080 (540 ) 540 1,080 - 1,080 2.0 1.0 Software technology 12,229 (997 ) 11,232 8,229 - 8,229 10.0 9.0 Customer relationships 10,070 (2,569 ) 7,501 10,070 (1,031 ) 9,039 6.0 - 9.0 4.8 Total intangible assets $ 24,829 $ (4,979 ) $ 19,850 $ 20,829 $ (1,745 ) $ 19,084
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	(in thousands) Estimated Amortization Expense 2019 $ 3,451 2020 2,895 2021 2,895 2022 2,895 2023 2,691 Thereafter 5,023 Total estimated amortization expense $ 19,850

Note 7 - Fair Value Measureme_2

Note 7 - Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	December 31, 2018 December 31, 2017 (in thousands) Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Financial Assets: Cash and cash equivalents Money market mutual funds $ 8,943 $ - $ - $ 3,034 $ - $ - Total $ 8,943 $ - $ - $ 3,034 $ - $ -

Note 8 - Marketable Securities

Note 8 - Marketable Securities (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Debt Securities, Held-to-maturity [Table Text Block]	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 December 31, 2017 (in thousands) Amortized Cost Unrealized Gains Unrealized Losses Fair Value U.S. government agency securities $ 32,320 $ - $ (199 ) $ 32,121 Corporate debt securities 29,806 - (128 ) 29,678 U.S. municipal securities 28,364 - (104 ) 28,260 Certificates of deposit/time deposits 3,968 - (32 ) 3,936 Total marketable securities $ 94,458 $ - $ (463 ) $ 93,995
Investments Classified by Contractual Maturity Date [Table Text Block]	December 31, (in thousands) 2018 Due in one year or less $ 46,750 Due after one year through five years 23,579 Total marketable securities $ 70,329

Note 9 - Property and Equipme_2

Note 9 - Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Property, Plant and Equipment [Table Text Block]	December 31, (in thousands) 2018 2017 Land $ 10,566 $ 8,910 Buildings and improvements 72,819 49,921 Machinery and equipment 185,416 148,535 Computer hardware and software 22,323 17,634 Leasehold improvements 7,330 6,634 Construction in progress 25,279 8,988 Total 323,733 240,622 Accumulated depreciation and amortization (95,732 ) (74,182 ) Property and equipment, net $ 228,001 $ 166,440

Note 10 - Inventory (Tables)

Note 10 - Inventory (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Inventory, Current [Table Text Block]	December 31, (in thousands) 2018 2017 Raw materials $ 9,560 $ 9,767 Work in process 792 1,998 Total inventory 10,352 11,765 Allowance for obsolescence (265 ) (494 ) Inventory, net of allowance $ 10,087 $ 11,271

Note 11 - Financing Obligatio_2

Note 11 - Financing Obligations (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Debt [Table Text Block]	December 31, (in thousands) 2018 2017 Revolving Credit Facility, with interest rates from 2.50% to 2.59%, due at maturity in November 2019 $ - $ 5,000 Total Financing Obligations $ - $ 5,000

Note 13 - Stock-based Compens_2

Note 13 - Stock-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]	Year Ended December 31, (in thousands) 2018 2017 2016 Stock options and other $ 10,113 $ 7,954 $ 6,177 Employee stock purchase plan 815 604 598 Total stock-based compensation expense $ 10,928 $ 8,558 $ 6,775 Cost of revenue $ 1,543 $ 970 $ 691 Operating expenses: Marketing and sales 1,942 1,429 977 Research and development 1,517 1,091 1,396 General and administrative 5,926 5,068 3,711 Total stock-based compensation expense $ 10,928 $ 8,558 $ 6,775
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Year Ended December 31, 2018 2017 2016 Risk-free interest rate 2.52 - 3.07% 2.24 - 2.36% 1.53 - 2.68% Expected life (years) 6.25 6.50 6.50 Expected volatility 41.68 - 42.22% 42.68 - 44.68% 44.38 - 45.93% Expected dividend yield 0% 0% 0% Weighted average grant date fair value $50.08 $32.26 $26.61
Share-based Compensation, Stock Options, Activity [Table Text Block]	Weighted- Average Stock Options Exercise Price Options outstanding at January 1, 2016 766,042 $ 36.52 Granted 117,480 57.99 Exercised (226,164 ) 16.65 Cancelled (87,719 ) 61.41 Options outstanding at December 31, 2016 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 Exercisable at December 31, 2018 125,925 $ 53.02
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]	Options Outstanding, Vested and Expected to Vest Options Exercisable Range of Exercise Prices Number Outstanding Weighted Weighted Average Exercise Price ($) Number Exercisable Weighted Average Exercise Price ($) $3.67 to $31.43 30,972 2.95 24.59 30,972 24.59 $31.44 to $66.87 133,492 5.36 58.52 69,210 58.78 $66.88 to $96.20 51,894 5.55 72.49 25,743 71.73 $96.21 to $123.10 36,258 9.23 110.59 0 0.00
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]	Weighted- Average Grant Date Restricted Fair Value Stock Awards Per Share Restricted stock at January 1, 2016 124,393 $ 68.97 Granted 161,555 59.37 Restrictions lapsed (41,415 ) 67.78 Forfeited (29,428 ) 63.23 Restricted stock at December 31, 2016 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
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, 2016 - $ - Granted - - Restrictions lapsed - - Forfeited - - Performance stock at December 31, 2016 - - 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 assumption change 6,427 58.35 Forfeited - - Performance stock at December 31, 2018 52,140 $ 76.54
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]	Year ended December 31, 2018 2017 2016 Risk-free interest rate 2.06 - 2.33% 0.97 - 1.48% 0.56 - 0.59% Expected life (months) 6.00 6.00 6.00 Expected volatility 31.50 - 37.36% 24.49 - 34.51% 39.51 - 49.13% Expected dividend yield 0% 0% 0%

Note 14 - Commitments (Tables)

Note 14 - Commitments (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	Operating Leases (in thousands) Years Ending December 31, 2019 $ 3,411 2020 2,612 2021 2,266 2022 2,211 2023 975 After 2023 2,142 Total future minimum lease payments $ 13,617

Note 15 - Accumulated Other C_2

Note 15 - Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Comprehensive Income (Loss) [Table Text Block]	Year Ended December 31, (in thousands) 2018 2017 2016 Foreign currency translation adjustments Balance at beginning of period $ (5,234 ) $ (10,753 ) $ (5,212 ) Other comprehensive (loss) income before reclassifications (3,258 ) 5,519 (5,541 ) Amounts reclassified from accumulated other comprehensive income (loss) - - - Net current-period other comprehensive (loss) income (3,258 ) 5,519 (5,541 ) Balance at end of period $ (8,492 ) $ (5,234 ) $ (10,753 )

Note 16 - Income Taxes (Tables)

Note 16 - Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]	Year Ended December 31, (in thousands) 2018 2017 2016 Domestic $ 81,893 $ 69,929 $ 59,232 Foreign 9,762 4,506 4,989 Total $ 91,655 $ 74,435 $ 64,221
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	Year Ended December 31, (in thousands) 2018 2017 2016 Current: Federal $ (782 ) $ 17,808 $ 15,119 State 2,078 1,367 1,091 Foreign 1,810 2,215 2,439 Deferred Federal 11,325 865 2,758 State 538 193 75 Foreign (430 ) (1,918 ) (1,960 ) Valuation Allowance 528 2,127 1,992 Total $ 15,067 $ 22,657 $ 21,514
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Year Ended December 31, 2018 2017 2016 Federal tax statutory rate 21.0 % 35.0 % 35.0 % State tax (net of federal benefit) 2.0 1.7 0.6 Share based compensation (2.8 ) (0.8 ) - Valuation allowance against deferred tax assets 0.7 2.9 3.1 Research and development credit (2.5 ) (2.2 ) (2.2 ) Foreign rate differential (0.1 ) (1.9 ) (2.8 ) Tax reserves (0.1 ) 0.9 1.4 Domestic manufacturing deduction - (2.5 ) (1.8 ) Other (0.5 ) (0.2 ) 0.1 Transition tax (0.8 ) 3.2 - Revaluation of deferred tax liability (0.5 ) (5.7 ) 0.0 Total 16.4 % 30.4 % 33.4 %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	December 31, (in thousands) 2018 2017 Deferred tax assets: Accrued expenses $ 931 $ 756 Stock options, restricted stock and other 2,908 2,309 Intangible assets 748 429 Inventories 154 220 Other assets 666 625 Net operating loss 6,605 6,374 Less valuation allowance (6,900 ) (6,633 ) Total deferred tax assets 5,112 4,080 Deferred tax liabilities: Depreciation (21,788 ) (9,528 ) Goodwill (3,486 ) (1,518 ) Total deferred tax liabilities (25,274 ) (11,046 ) Net deferred tax liability $ (20,162 ) $ (6,966 )
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	December 31, 2018 2017 Balance at beginning of period $ 4,233 $ 3,796 Additions for tax positions of current year 593 831 Additions for tax positions of prior years 309 48 Decrease related to expiration of statutes of limitations (1,039 ) (442 ) Balance at period end $ 4,096 $ 4,233

Note 18 - Segment Reporting (Ta

Note 18 - Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Income from Operations by Geographic Area [Table Text Block]	Year Ended December 31, (in thousands) 2018 2017 2016 Income from Operations: United States $ 120,641 $ 103,136 $ 89,308 Europe 16,804 12,846 11,657 Corporate Unallocated and Japan (48,547 ) (43,756 ) (39,198 ) Total income from operations $ 88,898 $ 72,226 $ 61,767
Long-lived Assets by Geographic Areas [Table Text Block]	December 31, December 31, December 31, (in thousands) 2018 2017 2016 Long-lived assets: United States $ 185,979 $ 125,308 $ 108,650 Europe 34,577 33,691 23,199 Japan 7,445 7,441 7,625 Total long-lived assets $ 228,001 $ 166,440 $ 139,474
Expenditures for Additions to Long-lived Assets by Geographic Region [Table Text Block]	Year Ended December 31, (in thousands) 2018 2017 2016 Expenditures for additions to long-lived assets: United States $ 78,762 $ 20,370 $ 21,190 Europe 7,576 11,704 5,954 Japan 766 561 6,472 Total expenditures for additions to long-lived assets $ 87,104 $ 32,635 $ 33,616
Depreciation and Amortization by Geographic Region [Table Text Block]	Year Ended December 31, (in thousands) 2018 2017 2016 Depreciation and Amortization: United States $ 21,117 $ 13,267 $ 12,533 Europe 4,679 4,174 3,386 Japan 958 1,033 1,566 Total depreciation and amortization $ 26,754 $ 18,474 $ 17,485
Operating Segments [Member]
Notes Tables
Revenue from External Customers by Geographic Areas [Table Text Block]	Year Ended December 31, (in thousands) 2018 2017 2016 Revenue: United States $ 350,535 $ 263,086 $ 223,930 Europe 80,889 70,154 63,365 Japan 14,172 11,250 10,760 Total revenue $ 445,596 $ 344,490 $ 298,055

Note 2 - Summary of Significa_2

Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	Nov. 30, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019	Jan. 01, 2018
Capitalized Computer Software, Net, Ending Balance		$ 4,900	$ 16,600	$ 4,900
Advertising Expense			11,800	10,700	$ 10,500
Research and Development Expense, Total			28,735	23,560	22,388
Payments to Acquire Businesses, Net of Cash Acquired, Total			90	$ 110,533
Cumulative Effect of New Accounting Principle in Period of Adoption			1,462
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member]
Operating Lease, Right-of-Use Asset						$ 14,000
Operating Lease, Liability, Total						$ 14,000
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
Rapid [Member]
Business Combination, Consideration Transferred, Total	$ 121,900	121,959
Payments to Acquire Businesses, Net of Cash Acquired, Total	110,600	110,623
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 11,300	$ 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, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 1,462
Revenue from Contract with Customer, Including Assessed Tax	445,596	$ 344,490	$ 298,055
Cost of Goods and Services Sold, Total	206,917	150,648	131,118
Increase (Decrease) in Accounts Receivable	6,098	9,933	(900)
Increase (Decrease) in Inventories, Total	189	$ 985	$ (136)
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, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Revenue	$ 445,596	$ 344,490	$ 298,055
Injection Molding (Protomold) [Member]
Revenue:
Revenue	210,523	194,432	175,974
CNC Machining (Firstcut) [Member]
Revenue:
Revenue	153,521	103,739	81,407
3D Printing (Fineline) [Member]
Revenue:
Revenue	53,342	43,329	37,847
Sheet Metal [Member]
Revenue:
Revenue	24,998	1,767
Other Products [Member]
Revenue:
Revenue	3,212	1,223	2,827
UNITED STATES
Revenue:
Revenue	350,535	263,086	223,930
Europe [Member]
Revenue:
Revenue	80,889	70,154	63,365
JAPAN
Revenue:
Revenue	$ 14,172	$ 11,250	$ 10,760

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Income	$ 76,588	$ 51,778	$ 42,707
Basic - weighted-average shares outstanding: (in shares)	26,982,614	26,647,610	26,365,173
Employee stock options and other (in shares)	296,202	197,461	199,466
Diluted - weighted-average shares outstanding: (in shares)	27,278,816	26,845,071	26,564,639
Basic (in dollars per share)	$ 2.84	$ 1.94	$ 1.62
Diluted (in dollars per share)	$ 2.81	$ 1.93	$ 1.61

Note 5 - Business Combination_2

Note 5 - Business Combinations (Details Textual) - USD ($) $ in Thousands	Nov. 30, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Payments to Acquire Businesses, Net of Cash Acquired, Total			$ 90	$ 110,533
Goodwill, Ending Balance		$ 128,504	128,752	128,504	28,916
Share-based Compensation, Total			$ 10,928	8,558	6,775
Trade Names [Member]
Finite-Lived Intangible Asset, Useful Life			2 years
Rapid [Member]
Business Combination, Consideration Transferred, Total	$ 121,900	121,959
Payments to Acquire Businesses, Net of Cash Acquired, Total	110,600	110,623
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	11,300	11,336
Goodwill, Ending Balance	$ 99,800	99,836		99,836
Business Acquisition, Goodwill, Expected Tax Deductible Period	15 years
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years 182 days
Business Combination, Acquisition Related Costs				1,900
Business Acquisition, Increase (Decrease) in Depreciation Expense				(900)	(600)
Amortization, Total				$ 3,000	3,100
Share-based Compensation, 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, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets acquired:
Goodwill, Ending Balance		$ 128,504	$ 128,752	$ 128,504	$ 28,916
Liabilities assumed:
Net cash consideration			$ 90	110,533
Rapid [Member]
Assets acquired:
Current assets		6,720		6,720
Goodwill, Ending Balance	$ 99,800	99,836		99,836
Other intangible assets		8,700		8,700
Other long-term assets		8,855		8,855
Total assets acquired		124,111		124,111
Liabilities assumed:
Current liabilities		2,067		2,067
Other long-term liabilities		85		85
Total liabilities assumed		2,152		2,152
Net assets acquired		121,959		$ 121,959
Cash paid		115,378
Cash acquired		(4,755)
Net cash consideration	110,600	110,623
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	11,300	11,336
Total purchase consideration	$ 121,900	$ 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, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 30, 2017
Goodwill, Ending Balance	$ 128,752	$ 128,504	$ 28,916
Amortization of Intangible Assets, Total	3,200	500	$ 700
Asset Acquisition, Contingent Consideration Arrangement Upon Completion of Milestone		$ 5,000
Asset Acquisitions, Contingent Consideration, Liability, Milestone Period		2 years
Asset Acquisitions, Contingent Consideration, Liability	4,000	$ 0
Computer Software, Intangible Asset [Member]
Finite-lived Intangible Assets Acquired		8,200
Rapid [Member]
Goodwill, Ending Balance		$ 99,836		$ 99,800
Business Combination, Working Capital Adjustment	$ 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, 2018	Dec. 31, 2017
Goodwill, balance as of the beginning of the period	$ 128,504	$ 28,916
Goodwill acquired during the period	248	99,588
Goodwill, balance as of the end of the period	128,752	128,504
UNITED STATES
Goodwill, balance as of the beginning of the period	123,635	24,047
Goodwill acquired during the period	248	99,588
Goodwill, balance as of the end of the period	123,883	123,635
Europe [Member]
Goodwill, balance as of the beginning of the period	4,239	4,239
Goodwill acquired during the period
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
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, 2018	Dec. 31, 2017
Gross	$ 24,829	$ 20,829
Accumulated Amortization	(4,979)	(1,745)
Net	$ 19,850	19,084
Minimum [Member]
Useful life (Year)	2 years
Maximum [Member]
Useful life (Year)	10 years
Noncompete Agreements [Member]
Gross	$ 270	270
Accumulated Amortization	(206)	(190)
Net	$ 64	80
Weighted Average Useful Life Remaining (Year)	4 years
Noncompete Agreements [Member] | Minimum [Member]
Useful life (Year)	2 years
Noncompete Agreements [Member] | Maximum [Member]
Useful life (Year)	5 years
Marketing-Related Intangible Assets [Member]
Useful life (Year)	10 years
Gross	$ 930	930
Accumulated Amortization	(434)	(341)
Net	$ 496	589
Weighted Average Useful Life Remaining (Year)	5 years 109 days
Trade Secrets [Member]
Useful life (Year)	5 years
Gross	$ 250	250
Accumulated Amortization	(233)	(183)
Net	$ 17	67
Weighted Average Useful Life Remaining (Year)	109 days
Trade Names [Member]
Useful life (Year)	2 years
Gross	$ 1,080	1,080
Accumulated Amortization	(540)
Net	$ 540	1,080
Weighted Average Useful Life Remaining (Year)	1 year
Computer Software, Intangible Asset [Member]
Useful life (Year)	10 years
Gross	$ 12,229	8,229
Accumulated Amortization	(997)
Net	$ 11,232	8,229
Weighted Average Useful Life Remaining (Year)	9 years
Customer Relationships [Member]
Gross	$ 10,070	10,070
Accumulated Amortization	(2,569)	(1,031)
Net	$ 7,501	$ 9,039
Weighted Average Useful Life Remaining (Year)	4 years 292 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, 2018	Dec. 31, 2017
2,019	$ 3,451
2,020	2,895
2,021	2,895
2,022	2,895
2,023	2,691
Thereafter	5,023
Total estimated amortization expense	$ 19,850	$ 19,084

Note 7 - Fair Value Measureme_3

Note 7 - Fair Value Measurements - Fair Value of Financial Assets Measured on a Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Inputs, Level 1 [Member]
Money market mutual funds	$ 8,943	$ 3,034
Total	8,943	3,034
Fair Value, Inputs, Level 2 [Member]
Money market mutual funds
Total
Fair Value, Inputs, Level 3 [Member]
Money market mutual funds
Total

Note 8 - Marketable Securitie_2

Note 8 - Marketable Securities - Short-term and Long-term Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Amortized Cost	$ 70,329	$ 94,458
Unrealized Gains	1
Unrealized Losses	(242)	(463)
Fair Value	70,088	93,995
Bank Time Deposits [Member]
Amortized Cost	4,208	3,968
Unrealized Gains
Unrealized Losses	(25)	(32)
Fair Value	4,183	3,936
US Government Agencies Debt Securities [Member]
Amortized Cost	16,843	32,320
Unrealized Gains
Unrealized Losses	(88)	(199)
Fair Value	16,755	32,121
Corporate Debt Securities [Member]
Amortized Cost	31,769	29,806
Unrealized Gains
Unrealized Losses	(96)	(128)
Fair Value	31,673	29,678
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	17,509	28,364
Unrealized Gains	1
Unrealized Losses	(33)	(104)
Fair Value	$ 17,477	$ 28,260

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, 2018	Dec. 31, 2017
Due in one year or less	$ 46,750
Due after one year through five years	23,579
Total marketable securities	$ 70,329	$ 94,458

Note 9 - Property and Equipme_3

Note 9 - Property and Equipment (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Depreciation, Total	$ 23.5	$ 18	$ 16.8

Note 9 - Property and Equipme_4

Note 9 - Property and Equipment - Components of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Land	$ 10,566	$ 8,910
Buildings and improvements	72,819	49,921
Machinery and equipment	185,416	148,535
Computer hardware and software	22,323	17,634
Leasehold improvements	7,330	6,634
Construction in progress	25,279	8,988
Total	323,733	240,622
Accumulated depreciation and amortization	(95,732)	(74,182)
Property and equipment, net	$ 228,001	$ 166,440	$ 139,474

Note 10 - Inventory - Inventory

Note 10 - Inventory - Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Raw materials	$ 9,560	$ 9,767
Work in process	792	1,998
Total inventory	10,352	11,765
Allowance for obsolescence	(265)	(494)
Inventory, net of allowance	$ 10,087	$ 11,271

Note 11 - Financing Obligatio_3

Note 11 - Financing Obligations (Details Textual) - Wells Fargo Bank, National Association [Member] $ in Millions	Nov. 27, 2017USD ($)
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 30
Line of Credit Facility, Commitment Fee Percentage	0.15%
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 5

Note 11 - Financing Obligatio_4

Note 11 - Financing Obligations - Debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Total Financing Obligations		$ 5
Revolving Credit Facility [Member]
Total Financing Obligations		$ 5

Note 11 - Financing Obligatio_5

Note 11 - Financing Obligations - Debt (Details) (Parentheticals) - Revolving Credit Facility [Member]	Dec. 31, 2017
Minimum [Member]
Interest rate	2.50%
Interest rate	2.50%
Maximum [Member]
Interest rate	2.59%
Interest rate	2.59%

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, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
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	90 days
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	50.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 2.7	$ 1.9	$ 1.6
UNITED KINGDOM
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 0.3	$ 0.3	$ 0.2

Note 13 - Stock-based Compens_3

Note 13 - Stock-based Compensation (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)shares	Dec. 31, 2017USD ($)shares	Dec. 31, 2016USD ($)
Number Of Equity Incentive Plans	2
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 13	$ 7	$ 11.1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 255 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 12.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	3 years 182 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 7.5
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total	$ 3.3
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 292 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	$ 1.5	$ 2.8	$ 3.6
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date	15.00%
Employee Stock Purchase Plan, Offering Period	180 days
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent	85.00%
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures, Total | shares	33,562	41,307
Employee Stock Purchase Plan, Weighted Average Purchase Price of Shares Purchased | shares	85.61	48.91
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares	1,210,445
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%	0.00%	0.00%
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%	0.00%	0.00%
Employee Stock Option [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Employee Stock Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years
Restricted Stock [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total	$ 20.7
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	3 years 36 days
Restricted Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total	$ 2.2
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 292 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, 2018	Dec. 31, 2017	Dec. 31, 2016
Allocated share-based compensation expense	$ 10,928	$ 8,558	$ 6,775
Cost of Sales [Member]
Allocated share-based compensation expense	1,543	970	691
Selling and Marketing Expense [Member]
Allocated share-based compensation expense	1,942	1,429	977
Research and Development Expense [Member]
Allocated share-based compensation expense	1,517	1,091	1,396
General and Administrative Expense [Member]
Allocated share-based compensation expense	5,926	5,068	3,711
Stock Options, Restricted Stock, and Other [Member]
Allocated share-based compensation expense	10,113	7,954	6,177
ESPP [Member]
Allocated share-based compensation expense	$ 815	$ 604	$ 598

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Expected dividend yield	0.00%
Employee Stock Option [Member]
Expected life (Year)	6 years 91 days	6 years 182 days	6 years 182 days
Expected dividend yield	0.00%	0.00%	0.00%
Weighted average grant date fair value (in dollars per share)	$ 50.08	$ 32.26	$ 26.61
Employee Stock Option [Member] | Minimum [Member]
Risk-free interest rate	2.52%	2.24%	1.53%
Expected volatility	41.68%	42.68%	44.38%
Employee Stock Option [Member] | Maximum [Member]
Risk-free interest rate	3.07%	2.36%	2.68%
Expected volatility	42.22%	44.68%	45.93%

Note 13 - Stock-based Compens_6

Note 13 - Stock-based Compensation - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Options outstanding (in shares)	399,055	569,639	766,042
Options outstanding, weighted- average exercise price (in dollars per share)	$ 51.13	$ 45	$ 36.52
Granted (in shares)	36,600	60,100	117,480
Granted, weighted- average exercise price (in dollars per share)	$ 110.59	$ 69.06	$ 57.99
Exercised (in shares)	(155,765)	(187,313)	(226,164)
Exercised, weighted- average exercise price (in dollars per share)	$ 38.92	$ 35.93	$ 16.65
Cancelled (in shares)	(27,274)	(43,371)	(87,719)
Cancelled, weighted- average exercise price (in dollars per share)	$ 74.35	$ 61.02	$ 61.41
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
Options exercisable (in shares)	125,925
Options exercisable, weighted- average exercise price (in dollars per share)	$ 53.02

Note 13 - Stock-based Compens_7

Note 13 - Stock-based Compensation - Information about Stock Options Outstanding (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Options outstanding, vested and expected to vest, number outstanding (in shares)	252,616	399,055	569,639	766,042
Options outstanding, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 64.71	$ 51.13	$ 45	$ 36.52
Exercise Price Range One [Member]
Range of exercise prices, lower limit (in dollars per share)	3.67
Range of exercise prices, upper limit (in dollars per share)	$ 31.43
Options outstanding, vested and expected to vest, number outstanding (in shares)	30,972
Options outstanding, vested and expected to vest, weighted average remaining contractual life (Year)	2 years 346 days
Options outstanding, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 24.59
Options exercisable, number exercisable (in shares)	30,972
Options exercisable, weighted average exercise price (in dollars per share)	$ 24.59
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)	133,492
Options outstanding, vested and expected to vest, weighted average remaining contractual life (Year)	5 years 131 days
Options outstanding, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 58.52
Options exercisable, number exercisable (in shares)	69,210
Options exercisable, weighted average exercise price (in dollars per share)	$ 58.78
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)	51,894
Options outstanding, vested and expected to vest, weighted average remaining contractual life (Year)	5 years 200 days
Options outstanding, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 72.49
Options exercisable, number exercisable (in shares)	25,743
Options exercisable, weighted average exercise price (in dollars per share)	$ 71.73
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)	36,258
Options outstanding, vested and expected to vest, weighted average remaining contractual life (Year)	9 years 83 days
Options outstanding, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 110.59
Options exercisable, number exercisable (in shares)	0
Options exercisable, weighted average exercise price (in dollars per share)	$ 0

Note 13 - Stock-based Compens_8

Note 13 - Stock-based Compensation - Restricted Stock Options (Details) - Restricted Stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted stock (in shares)	334,831	215,105	124,393
Restricted stock, weighted-average grant date fair value (in dollars per share)	$ 63.29	$ 62.78	$ 68.97
Granted (in shares)	106,855	210,744	161,555
Granted, weighted-average grant date fair value (in dollars per share)	$ 115.41	$ 63.70	$ 59.37
Restrictions lapsed (in shares)	(86,191)	(60,102)	(41,415)
Restrictions lapsed, weighted-average grant date fair value (in dollars per share)	$ 63.64	$ 63.60	$ 67.78
Forfeited (in shares)	(31,574)	(30,916)	(29,428)
Forfeited, weighted-average grant date fair value (in dollars per share)	$ 68.67	$ 61.99	$ 63.23
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

Note 13 - Stock-based Compens_9

Note 13 - Stock-based Compensation - Performance Stock (Details) - Performance Shares [Member] - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted stock (in shares)	25,707
Restricted stock, weighted-average grant date fair value (in dollars per share)	$ 58.35
Granted (in shares)	20,006	25,707
Granted, weighted-average grant date fair value (in dollars per share)	$ 105.75	$ 58.35
Restrictions lapsed (in shares)
Restrictions lapsed, weighted-average grant date fair value (in dollars per share)
Forfeited (in shares)
Forfeited, weighted-average grant date fair value (in dollars per share)
Granted (in shares)	20,006	25,707
Granted, weighted-average grant date fair value (in dollars per share)	$ 105.75	$ 58.35
Restrictions lapsed (in shares)
Restrictions lapsed, weighted-average grant date fair value (in dollars per share)
Forfeited (in shares)
Forfeited, weighted-average grant date fair value (in dollars per share)
Performance assumption change (in shares)	6,427
Performance assumption change, weighted-average grant date fair value (in dollars per share)	$ 58.35
Restricted stock (in shares)	52,140	25,707
Restricted stock, weighted-average grant date fair value (in dollars per share)	$ 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, 2018	Dec. 31, 2017	Dec. 31, 2016
Expected dividend yield	0.00%
ESPP [Member]
Expected life (Month)	180 days	180 days	180 days
Expected dividend yield	0.00%	0.00%	0.00%
ESPP [Member] | Minimum [Member]
Risk-free interest rate	2.06%	0.97%	0.56%
Expected volatility	31.50%	24.49%	39.51%
ESPP [Member] | Maximum [Member]
Risk-free interest rate	2.33%	1.48%	0.59%
Expected volatility	37.36%	34.51%	49.13%

Note 14 - Commitments (Details

Note 14 - Commitments (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Leases, Rent Expense, Net, Total	$ 4,200	$ 3,000	$ 3,600
Asset Acquisitions, Contingent Consideration, Liability	$ 4,000	$ 0

Note 14 - Commitments - Future

Note 14 - Commitments - Future Minimum Commitments under Non-cancelable Leases (Details) $ in Thousands	Dec. 31, 2018USD ($)
2,019	$ 3,411
2,020	2,612
2,021	2,266
2,022	2,211
2,023	975
After 2,023	2,142
Total future minimum lease payments	$ 13,617

Note 15 - Accumulated Other C_3

Note 15 - Accumulated Other Comprehensive Loss - Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Balance	$ 461,215	$ 379,833	$ 327,645
Balance	541,497	461,215	379,833
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(5,234)	(10,753)	(5,212)
Other comprehensive (loss) income before reclassifications	(3,258)	5,519	(5,541)
Amounts reclassified from accumulated other comprehensive income (loss)
Net current-period other comprehensive (loss) income	(3,258)	5,519	(5,541)
Balance	$ (8,492)	$ (5,234)	$ (10,753)

Note 16 - Income Taxes (Details

Note 16 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Expense (Benefit), Total	$ 15,067	$ 22,657	$ 21,514
Effective Income Tax Rate Reconciliation, Percent, Total	16.40%	30.40%	33.40%
Effective Income Tax Rate Continuing Operations Increase (Decrease) During the Period	(14.00%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%	35.00%
Income Tax Expense (Benefit), Adjustments for Transition Tax		$ 2,400
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ 500	(4,200)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	(700)
Tax Cuts and Jobs Act of 2017, Income Tax Expense (Benefit)	3,000
Undistributed Earnings of Foreign Subsidiaries	6,800
Operating Loss Carryforwards, Total	$ 22,500
Operating Loss Carryforwards, Expiration Period	10 years
Operating Loss Carryforwards, Percentage of Taxable Income	50.00%
Deferred Tax Assets, Valuation Allowance, Total	$ 6,900	6,633
Unrecognized Tax Benefits, Ending Balance	$ 4,096	$ 4,233	$ 3,796

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Domestic	$ 81,893	$ 69,929	$ 59,232
Foreign	9,762	4,506	4,989
Income before income taxes	$ 91,655	$ 74,435	$ 64,221

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ (782)	$ 17,808	$ 15,119
State	2,078	1,367	1,091
Foreign	1,810	2,215	2,439
Deferred
Federal	11,325	865	2,758
State	538	193	75
Foreign	(430)	(1,918)	(1,960)
Valuation Allowance	528	2,127	1,992
Total	$ 15,067	$ 22,657	$ 21,514

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Federal tax statutory rate	21.00%	35.00%	35.00%
State tax (net of federal benefit)	2.00%	1.70%	0.60%
Share based compensation	(2.80%)	(0.80%)
Valuation allowance against deferred tax assets	0.70%	2.90%	3.10%
Research and development credit	(2.50%)	(2.20%)	(2.20%)
Foreign rate differential	(0.10%)	(1.90%)	(2.80%)
Tax reserves	(0.10%)	0.90%	1.40%
Domestic manufacturing deduction		(2.50%)	(1.80%)
Other	(0.50%)	(0.20%)	0.10%
Transition tax	(0.80%)	3.20%
Revaluation of deferred tax liability	(0.50%)	(5.70%)	0.00%
Total	16.40%	30.40%	33.40%

Note 16 - Income Taxes - Sign_2

Note 16 - Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Accrued expenses	$ 931	$ 756
Stock options, restricted stock and other	2,908	2,309
Intangible assets	748	429
Inventories	154	220
Other assets	666	625
Net operating loss	6,605	6,374
Less valuation allowance	(6,900)	(6,633)
Total deferred tax assets	5,112	4,080
Deferred tax liabilities:
Depreciation	(21,788)	(9,528)
Goodwill	(3,486)	(1,518)
Total deferred tax liabilities	(25,274)	(11,046)
Net deferred tax liability	$ (20,162)	$ (6,966)

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, 2018	Dec. 31, 2017
Balance	$ 4,233	$ 3,796
Additions for tax positions of current year	593	831
Additions for tax positions of prior years	309	48
Decrease related to expiration of statutes of limitations	(1,039)	(442)
Balance	$ 4,096	$ 4,233

Note 18 - Segment Reporting - R

Note 18 - Segment Reporting - Revenue From Operations by Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Revenue	$ 445,596	$ 344,490	$ 298,055
Operating Segments [Member] | United States Segment [Member]
Revenue:
Revenue	350,535	263,086	223,930
Operating Segments [Member] | Europe Segment [Member]
Revenue:
Revenue	80,889	70,154	63,365
Operating Segments [Member] | Japan Segment [Member]
Revenue:
Revenue	$ 14,172	$ 11,250	$ 10,760

Note 18 - Segment Reporting - I

Note 18 - Segment Reporting - Income From Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income from operations	$ 88,898	$ 72,226	$ 61,767
Operating Segments [Member] | United States Segment [Member]
Income from operations	120,641	103,136	89,308
Operating Segments [Member] | Europe Segment [Member]
Income from operations	16,804	12,846	11,657
Corporate and Reconciling Items [Member] | Corporate Unallocated and Japan Segment[Member]
Income from operations	$ (48,547)	$ (43,756)	$ (39,198)

Note 18 - Segment Reporting - L

Note 18 - Segment Reporting - Long-lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Long-lived assets	$ 228,001	$ 166,440	$ 139,474
Operating Segments [Member] | United States Segment [Member]
Long-lived assets	185,979	125,308	108,650
Operating Segments [Member] | Europe Segment [Member]
Long-lived assets	34,577	33,691	23,199
Operating Segments [Member] | Japan Segment [Member]
Long-lived assets	$ 7,445	$ 7,441	$ 7,625

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Expenditures for additions to long-lived assets	$ 87,104	$ 32,635	$ 33,616
UNITED STATES
Expenditures for additions to long-lived assets	78,762	20,370	21,190
Europe [Member]
Expenditures for additions to long-lived assets	7,576	11,704	5,954
JAPAN
Expenditures for additions to long-lived assets	$ 766	$ 561	$ 6,472

Note 18 - Segment Reporting - D

Note 18 - Segment Reporting - Depreciation and Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Depreciation and amortization	$ 26,754	$ 18,474	$ 17,485
UNITED STATES
Depreciation and amortization	21,117	13,267	12,533
Europe [Member]
Depreciation and amortization	4,679	4,174	3,386
JAPAN
Depreciation and amortization	$ 958	$ 1,033	$ 1,566