Proto Labs (PRLB) 10-Q/A 6 May 14 2014 Q1 Quarterly report (amended) Financial data

Document_And_Entity_Informatio

Document And Entity Information	3 Months Ended
	Mar. 31, 2014	Apr. 30, 2014
Document and Entity Information [Abstract]	'	'
Entity Registrant Name	'Proto Labs Inc	'
Document Type	'10-Q	'
Current Fiscal Year End Date	'--12-31	'
Entity Common Stock, Shares Outstanding	'	25,611,140
Amendment Flag	'true	'
Amendment Description	'Proto Labs, Inc. (the "Company") is filing this amendment to its Quarterly Report on Form 10-Q for the quarter ended March 31, 2014 (the "Original Form 10-Q"), filed with the U.S. Securities and Exchange Commission on May 6, 2014, to correct an error on the cover page. The cover page of the Original Form 10-Q inadvertently omitted the number of shares of the Company's Common Stock outstanding as of April 30, 2014. The cover page of this Form 10-Q/A includes the number of shares of the Company's Common Stock outstanding as of April 30, 2014. This Form 10-Q/A amends and restates in its entirety the Original Form 10-Q, but, except as specifically noted above, contains the same disclosure as is in the Original Form 10-Q.	'
Entity Central Index Key	'0001443669	'
Entity Current Reporting Status	'Yes	'
Entity Voluntary Filers	'No	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Well-known Seasoned Issuer	'Yes	'
Document Period End Date	31-Mar-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'

Consolidated_Balance_Sheets_Cu

Consolidated Balance Sheets (Current Period Unaudited) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets	'	'
Cash and cash equivalents	$44,201	$43,039
Short-term marketable securities	34,360	36,339
Accounts receivable, net of allowance for doubtful accounts of $98 and $90 as of March 31, 2014 and December 31, 2013, respectively	21,905	18,320
Inventory	5,346	5,166
Prepaid expenses and other current assets	4,406	3,569
Income taxes receivable	'	2,907
Deferred tax assets	456	455
Total current assets	110,674	109,795
Property and equipment, net	63,963	56,101
Long-term marketable securities	71,315	64,023
Other long-term assets	249	256
Total assets	246,201	230,175
Current liabilities	'	'
Accounts payable	10,405	6,455
Accrued compensation	4,779	6,196
Accrued liabilities and other	1,304	808
Income taxes payable	145	'
Current portion of long-term debt obligations	208	204
Total current liabilities	16,841	13,663
Long-term deferred tax liabilities	3,779	3,682
Long-term debt obligations	106	159
Other long-term liabilities	999	1,028
Total liabilities	21,725	18,532
Shareholders' equity	'	'
Preferred stock, $0.001 par value, authorized 10,000,000 shares; issued and outstanding 0 shares as of each of March 31, 2014 and December 31, 2013	'	'
Common stock, $0.001 par value, authorized 150,000,000 shares; issued and outstanding 25,606,090 and 25,546,107 shares as of March 31, 2014 and December 31, 2013, respectively	26	26
Additional paid-in capital	169,420	166,861
Retained earnings	55,949	45,847
Accumulated other comprehensive income (loss)	-919	-1,091
Total shareholders' equity	224,476	211,643
Total liabilities and shareholders' equity	$246,201	$230,175

Consolidated_Balance_Sheets_Cu1

Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Allowance for doubtful accounts (in Dollars)	$98	$90
Preferred stock, par value (in Dollars per share)	$0.00	$0.00
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in Dollars per share)	$0.00	$0.00
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	25,606,090	25,546,107
Common stock, shares outstanding	25,606,090	25,546,107

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Statements of Operations:	'	'
Revenue	$46,074	$37,313
Cost of revenue	17,050	14,034
Gross profit	29,024	23,279
Operating expenses	'	'
Marketing and sales	6,417	5,263
Research and development	3,456	2,628
General and administrative	4,703	3,994
Total operating expenses	14,576	11,885
Income from operations	14,448	11,394
Other income, net	103	3
Income before income taxes	14,551	11,397
Provision for income taxes	4,449	3,110
Net income	10,102	8,287
Net income per share:	'	'
Basic (in Dollars per share)	$0.40	$0.33
Diluted (in Dollars per share)	$0.39	$0.32
Shares used to compute net income per share:	'	'
Basic (in Shares)	25,573,851	25,014,907
Diluted (in Shares)	26,091,069	25,645,744
Comprehensive Income (net of tax)	'	'
Comprehensive income	$10,274	$7,380

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Operating activities	'	'
Net income	$10,102	$8,287
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	2,106	1,734
Stock-based compensation expense	998	865
Deferred taxes	107	148
Excess tax benefit from stock-based compensation	-897	-4,067
Amortization of held-to-maturity securities	482	304
Changes in operating assets and liabilities:	'	'
Accounts receivable	-3,554	-1,929
Inventories	-166	-183
Prepaid expenses and other	-828	393
Income taxes	3,951	2,719
Accounts payable	3,929	1,115
Accrued liabilities and other	-964	1,759
Net cash provided by operating activities	15,266	11,145
Investing activities	'	'
Purchases of property and equipment	-9,892	-2,548
Purchases of marketable securities	-32,385	-41,088
Proceeds from maturities of marketable securities	26,590	18,313
Net cash used in investing activities	-15,687	-25,323
Financing activities	'	'
Payments on debt	-50	-92
Proceeds from exercises of stock options and other	665	1,619
Excess tax benefit from stock-based compensation	897	4,067
Net cash provided by financing activities	1,512	5,594
Effect of exchange rate changes on cash and cash equivalents	71	-246
Net increase (decrease) in cash and cash equivalents	1,162	-8,830
Cash and cash equivalents, beginning of period	43,039	36,759
Cash and cash equivalents, end of period	$44,201	$27,929

Note_1_Basis_of_Presentation

Note 1 - Basis of Presentation	3 Months Ended
	Mar. 31, 2014
Disclosure Text Block [Abstract]	'
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	'
	Note 1 – Basis of Presentation
	The unaudited interim Consolidated Financial Statements of Proto Labs, Inc. (Proto Labs, the Company, we, us or our) have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. These statements are unaudited but, in the opinion of management, reflect all adjustments necessary for a fair presentation of the Company’s statement of financial position, results of operations and cash flows for the periods presented. Except as otherwise disclosed herein, these adjustments consist of normal, recurring items. Operating results for interim periods are not necessarily indicative of results that may be expected for the fiscal year as a whole.
	The preparation of the financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses, and the related disclosures at the date of the financial statements and during the reporting period. Actual results could materially differ from these estimates. For further information, refer to the audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013 as filed with the Securities and Exchange Commission (SEC) on February 28, 2014.
	The accompanying Consolidated Balance Sheet as of December 31, 2013 was derived from the audited Consolidated Financial Statements but does not include all disclosures required by U.S. GAAP for a full set of financial statements. This Form 10-Q should be read in conjunction with the Company’s Consolidated Financial Statements and Notes included in the Annual Report on Form 10-K filed on February 28, 2014 as referenced above.

Note_2_Net_Income_per_Common_S

Note 2 - Net Income per Common Share	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share [Text Block]	'
	Note 2 – 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, restricted stock units and restricted stock awards granted under stock-based compensation plans and shares committed to be purchased under the employee stock purchase plan.
	The table below sets forth the computation of basic and diluted net income per share:
		Three Months Ended
		March 31,
	(in thousands, except share and per share amounts)	2014		2013
	Net income	$	10,102	$	8,287
	Basic - weighted-average shares outstanding:		25,573,851		25,014,907
	Effect of dilutive securities:
	Employee stock options and other		517,218		630,837
	Diluted - weighted-average shares outstanding:		26,091,069		25,645,744
	Net income per share:
	Basic	$	0.4	$	0.33
	Diluted	$	0.39	$	0.32

Note_3_Fair_Value_Measurements

Note 3 - Fair Value Measurements	3 Months Ended
	Mar. 31, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Disclosures [Text Block]	'
	Note 3 – Fair Value Measurements
	Accounting Standards Codification (ASC) 820, Fair Value Measurement (ASC 820), defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. ASC 820 also establishes a fair value hierarchy which requires classification based on observable and unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value:
	Level 1—Quoted prices in active markets for identical assets or liabilities.
	Level 2—Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
	Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
	The Company’s cash consists of bank deposits. The Company’s cash equivalents measured at fair value consist of money market mutual funds. The Company determines the fair value of these investments using Level 1 inputs.
	A summary of financial assets as of March 31, 2014 and December 31, 2013 measured at fair value on a recurring basis follows:
		31-Mar-14						31-Dec-13
	(in thousands)	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
	Financial Assets:
	Cash and cash equivalents
	Money market mutual fund	$	14,339	$	-	$	-	$	5,524	$	-	$	-
	Total	$	14,339	$	-	$	-	$	5,524	$	-	$	-

Note_4_Marketable_Securities

Note 4 - Marketable Securities	3 Months Ended
	Mar. 31, 2014
Investments Schedule [Abstract]	'
Investment [Text Block]	'
	Note 4 – Marketable Securities
	The Company invests in short-term and long-term agency, municipal, corporate, commercial paper and other debt securities. The securities are categorized as held-to-maturity and are recorded at amortized cost. Categorization as held-to-maturity is based on the Company’s ability and intent to hold these securities to maturity. Information regarding the Company’s short-term and long-term marketable securities as of March 31, 2014 and December 31, 2013 is as follows:
		31-Mar-14
	(in thousands)	Amortized		Unrealized		Unrealized			Fair Value
		Cost		Gains		Losses
	U.S. government agency securities	$	24,476	$	1	$	(63	)	$	24,414
	Corporate debt securities		37,314		30		(76	)		37,268
	Commercial paper		1,996		-		(15	)		1,981
	U.S. municipal securities		36,949		60		(10	)		36,999
	Certificates of deposit/time deposits		4,940		8		(2	)		4,946
	Total marketable securities	$	105,675	$	99	$	(166	)	$	105,608
		31-Dec-13
	(in thousands)	Amortized		Unrealized		Unrealized			Fair Value
		Cost		Gains		Losses
	U.S. government agency securities	$	21,713	$	2	$	(22	)	$	21,693
	Corporate debt securities		29,480		30		(20	)		29,490
	U.S. municipal securities		44,474		49		(22	)		44,501
	Certificates of deposit/time deposits		4,695		5		(8	)		4,692
	Total marketable securities	$	100,362	$	86	$	(72	)	$	100,376
	Fair values for the corporate debt securities are primarily determined based on quoted market prices (Level 1).  Fair values for the U.S. municipal securities, U.S. government agency securities, certificates of deposit and commercial paper are primarily determined using dealer quotes or quoted market prices for similar securities (Level 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 Company intends 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 March 31, 2014 balance of held-to-maturity debt securities by contractual maturity is shown in the following table at amortized cost. Actual maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.
	(in thousands)	March 31,
		2014
	Due in one year or less	$	34,360
	Due after one year through five years		71,315
	Total marketable securities	$	105,675

Note_5_Inventory

Note 5 - Inventory	3 Months Ended
	Mar. 31, 2014
Inventory Disclosure [Abstract]	'
Inventory Disclosure [Text Block]	'
	Note 5 – 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-in, first-out (FIFO) cost. The Company periodically reviews its inventory for slow-moving, damaged and discontinued items and provides allowances to reduce such items identified to their recoverable amounts.
	The Company’s inventory consists of the following:
	(in thousands)	March 31,			December 31,
		2014			2013
	Raw materials	$	4,996		$	4,875
	Work in process		535			410
	Total inventory		5,531			5,285
	Allowance for obsolescence		(185	)		(119	)
	Inventory, net of allowance	$	5,346		$	5,166

Note_6_StockBased_Compensation

Note 6 - Stock-Based Compensation	3 Months Ended
	Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	'
	Note 6 – Stock-Based Compensation
	Under the 2012 Long-Term Incentive Plan (2012 Plan), the Company has the ability to grant stock options, stock appreciation rights (SARs), restricted stock, stock units, other stock-based awards and cash incentive awards. Awards under the 2012 Plan will have a maximum term of ten years from the date of grant. The compensation committee may provide that the vesting or payment of any award will be subject to the attainment of specified performance measures in addition to the satisfaction of any continued service requirements and the compensation committee will determine whether such measures have been achieved. The per share exercise price of stock options and SARs granted under the 2012 Plan generally may not be less than the fair market value of a share of our common stock on the date of the grant.
	Employee Stock Purchase Plan
	The Company’s 2012 Employee Stock Purchase Plan (ESPP), allows eligible employees to purchase shares of the Company’s common stock at a discount through payroll deductions of up to 15 percent of their eligible compensation, subject to plan limitations. The ESPP provides for six-month offering periods ending May 15 and November 15, respectively. At the end of each offering period, employees are able to purchase shares at 85 percent of the lower of the fair market value of the Company’s common stock on the first trading day of the offering period or on the last trading day of the offering period.
	Stock-Based Compensation Expense
	Stock-based compensation expense was $1.0 million and $0.9 million for the three months ended March 31, 2014 and 2013, respectively.
	Stock Options
	A summary of stock option activity for the three months ended March 31, 2014 is as follows:
		Stock Options			Weighted-
					Average
					Exercise Price
	Options outstanding at December 31, 2013		1,143,250		$	19.03
	Granted		69,350			78.59
	Exercised		(47,255	)		14.06
	Forfeited		(804	)		30.58
	Options outstanding at March 31, 2014		1,164,541		$	22.77
	Exercisable at March 31, 2014		434,412		$	10.99
	The outstanding options generally have a term of ten years. For employees, options granted become exercisable ratably over the vesting period, which is generally a five-year period beginning on the first anniversary of the grant date, subject to the employee’s continuing service to the Company. For directors, options generally become exercisable in full on the first anniversary of the grant date.
	The weighted-average grant date fair value of options that were granted during the three months ended March 31, 2014 was $39.85.
	The following table provides the assumptions used in the Black-Scholes pricing model valuation of options during the three months ended March 31, 2014 and 2013, respectively:
		Three Months Ended March 31,
		2014			2013
	Risk-free interest rate		2.14	%		1.27	%
	Expected life (years)		6.5			6.5
	Expected volatility		49.3	%		53.54	%
	Expected dividend yield		0	%		0	%
	As of March 31, 2014, there was $9.0 million of unrecognized compensation expense related to unvested stock options, which is expected to be recognized over a weighted-average period of 3.8 years.
	Restricted Stock
	Restricted stock are non-vested stock that include grants of restricted stock awards (RSA) and grants of restricted stock units (RSU). During the three months ended March 31, 2014, the Company granted both RSA and RSU.
	Non-vested restricted stock as of March 31, 2014 and changes during the three months ended March 31, 2014 were as follows:
		Stock Options			Weighted-
					Average
					Grant Date
					Fair Value
					Per Share
	Restricted stock outstanding at December 31, 2013		-		$	-
	Granted		31,693			78.59
	Vested		-			-
	Forfeited		-			-
	Restricted stock outstanding at March 31, 2014		31,693		$	78.59
	As of March 31, 2014, there was $2.4 million of unrecognized compensation expense related to non-vested restricted stock, which is expected to be recognized over a weighted-average period of 4.5 years.
	Employee Stock Purchase Plan
	The following table presents the assumptions used to estimate the fair value of the ESPP during the three months ended March 31, 2014 and 2013, respectively:
		Three Months Ended March 31,
		2014			2013
	Risk-free interest rate		0.11	%		0.13	%
	Expected life (months)		6			6
	Expected volatility		39.8	%		53.14	%
	Expected dividend yield		0	%		0	%

Note_7_Accumulated_Other_Compr

Note 7 - Accumulated Other Comprehensive Income	3 Months Ended
	Mar. 31, 2014
Partners' Capital, Comprehensive Income [Abstract]	'
Disclosure of Reclassification Amount [Text Block]	'
	Note 7 – Accumulated Other Comprehensive Income
	Other comprehensive income (loss) is comprised entirely of foreign currency translation adjustments. The following table presents the changes in accumulated other comprehensive income balances during the three months ended March 31, 2014 and 2013, respectively:
		Three Months Ended
		March 31,
	(in thousands)	2014			2013
	Foreign currency translation adjustment, net of tax
	Balance at beginning of period	$	(1,091	)	$	(928	)
	Other comprehensive income before reclassifications		172			(907	)
	Amounts reclassified from accumulated other comprehensive income		-			-
	Net current-period other comprehensive income		172			(907	)
	Balance at end of period	$	(919	)	$	(1,835	)

Note_8_Income_Taxes

Note 8 - Income Taxes	3 Months Ended
	Mar. 31, 2014
Income Tax Disclosure [Abstract]	'
Income Tax Disclosure [Text Block]	'
	Note 8 – 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 three months ended March 31, 2014 and 2013 the Company recorded an income tax provision of $4.4 million and $3.1 million, respectively. The income tax provision is based on the estimated annual effective tax rate for the year applied to pre-tax income. The effective income tax rate for the three months ended March 31, 2014 was 30.6 percent compared with 27.3 percent in the same period of the prior year.
	The effective income tax rate for the three months ended March 31, 2014 differs from the U.S. federal statutory rate of 35 percent due primarily to the mix of revenue earned in domestic and foreign tax jurisdictions and deductions for which the Company qualifies.
	On January 2, 2013, the American Taxpayer Relief Act of 2012 (the Act) was signed into law. Included in the Act was the extension of the research and development credit for years 2012 and 2013. As the Act was enacted during 2013, the federal portion of the 2012 research and development credit was recognized in the first quarter of 2013. As a result, during the three months ended March 31, 2013, the Company recorded a tax benefit of $0.3 million, which translated to an effective income tax rate reduction of 3.0 percent related to the federal research and development credit for 2012. Absent the impact of the Act, the effective income tax rates would have been similar for the three month periods ended March 31, 2014 and 2013, respectively.
	The Company has liabilities related to unrecognized tax benefits totaling $0.7 million at March 31, 2014 and December 31, 2013. There were no material adjustments to the unrecorded tax benefits during the three months ended March 31, 2014, and the Company does not anticipate that total unrecognized tax benefits will materially change in the next twelve months. The Company recognizes interest and penalties related to income tax matters in income tax expense, and reports the liability in current or long-term income taxes payable as appropriate.

Note_9_Revenue_and_Geographic_

Note 9 - Revenue and Geographic Information	3 Months Ended
	Mar. 31, 2014
Segment Reporting [Abstract]	'
Segment Reporting Disclosure [Text Block]	'
	Note 9 – Revenue and Geographic Information
	The Company’s revenue is derived from its Protomold injection molding and Firstcut computer numerical control (CNC) machining product lines. Total revenue by product line is as follows:
		Three Months Ended March 31,
	(in thousands)	2014		2013
	Revenue:
	Protomold	$	32,694	$	26,880
	Firstcut		13,380		10,433
	Total revenue	$	46,074	$	37,313
	Revenue to external customers based on the billing location of the end user customer and long-lived assets by geographic region are as follows:
		Three Months Ended March 31,
	(in thousands)	2014		2013
	Revenue:
	United States	$	33,022	$	28,148
	International		13,052		9,165
	Total revenue	$	46,074	$	37,313
	(in thousands)	March 31,		December 31,
		2014		2013
	Long-lived assets:
	United States	$	55,897	$	48,381
	International		8,066		7,720
	Total long-lived assets	$	63,963	$	56,101

Note_10_Subsequent_Events

Note 10 - Subsequent Events	3 Months Ended
	Mar. 31, 2014
Subsequent Events [Abstract]	'
Subsequent Events [Text Block]	'
	Note 10 – Subsequent Events
	In April 2014, the Company acquired 100 percent of the shares of FineLine Prototyping, Inc., a leading provider of additive manufacturing services. Total consideration paid for this acquisition was $37 million, $34 million of which was paid in cash at the time of closing and up to an additional $3 million in cash based on the achievement of certain milestones related to the integration of FineLine’s and the Company’s businesses. The acquisition is not significant to the Company’s operating results.

Note_2_Net_Income_per_Common_S1

Note 2 - Net Income per Common Share (Tables)	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	'
		Three Months Ended
		March 31,
	(in thousands, except share and per share amounts)	2014		2013
	Net income	$	10,102	$	8,287
	Basic - weighted-average shares outstanding:		25,573,851		25,014,907
	Effect of dilutive securities:
	Employee stock options and other		517,218		630,837
	Diluted - weighted-average shares outstanding:		26,091,069		25,645,744
	Net income per share:
	Basic	$	0.4	$	0.33
	Diluted	$	0.39	$	0.32

Note_3_Fair_Value_Measurements1

Note 3 - Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2014
Fair Value Disclosures [Abstract]	'
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	'
		31-Mar-14						31-Dec-13
	(in thousands)	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
	Financial Assets:
	Cash and cash equivalents
	Money market mutual fund	$	14,339	$	-	$	-	$	5,524	$	-	$	-
	Total	$	14,339	$	-	$	-	$	5,524	$	-	$	-

Note_4_Marketable_Securities_T

Note 4 - Marketable Securities (Tables)	3 Months Ended
	Mar. 31, 2014
Investments Schedule [Abstract]	'
Held-to-maturity Securities [Table Text Block]	'
		31-Mar-14
	(in thousands)	Amortized		Unrealized		Unrealized			Fair Value
		Cost		Gains		Losses
	U.S. government agency securities	$	24,476	$	1	$	(63	)	$	24,414
	Corporate debt securities		37,314		30		(76	)		37,268
	Commercial paper		1,996		-		(15	)		1,981
	U.S. municipal securities		36,949		60		(10	)		36,999
	Certificates of deposit/time deposits		4,940		8		(2	)		4,946
	Total marketable securities	$	105,675	$	99	$	(166	)	$	105,608
		31-Dec-13
	(in thousands)	Amortized		Unrealized		Unrealized			Fair Value
		Cost		Gains		Losses
	U.S. government agency securities	$	21,713	$	2	$	(22	)	$	21,693
	Corporate debt securities		29,480		30		(20	)		29,490
	U.S. municipal securities		44,474		49		(22	)		44,501
	Certificates of deposit/time deposits		4,695		5		(8	)		4,692
	Total marketable securities	$	100,362	$	86	$	(72	)	$	100,376
Investments Classified by Contractual Maturity Date [Table Text Block]	'
	(in thousands)	March 31,
		2014
	Due in one year or less	$	34,360
	Due after one year through five years		71,315
	Total marketable securities	$	105,675

Note_5_Inventory_Tables

Note 5 - Inventory (Tables)	3 Months Ended
	Mar. 31, 2014
Inventory Disclosure [Abstract]	'
Schedule of Inventory, Current [Table Text Block]	'
	(in thousands)	March 31,			December 31,
		2014			2013
	Raw materials	$	4,996		$	4,875
	Work in process		535			410
	Total inventory		5,531			5,285
	Allowance for obsolescence		(185	)		(119	)
	Inventory, net of allowance	$	5,346		$	5,166

Note_6_StockBased_Compensation1

Note 6 - Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	'
		Stock Options			Weighted-
					Average
					Exercise Price
	Options outstanding at December 31, 2013		1,143,250		$	19.03
	Granted		69,350			78.59
	Exercised		(47,255	)		14.06
	Forfeited		(804	)		30.58
	Options outstanding at March 31, 2014		1,164,541		$	22.77
	Exercisable at March 31, 2014		434,412		$	10.99
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	'
		Three Months Ended March 31,
		2014			2013
	Risk-free interest rate		2.14	%		1.27	%
	Expected life (years)		6.5			6.5
	Expected volatility		49.3	%		53.54	%
	Expected dividend yield		0	%		0	%
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]	'
		Stock Options			Weighted-
					Average
					Grant Date
					Fair Value
					Per Share
	Restricted stock outstanding at December 31, 2013		-		$	-
	Granted		31,693			78.59
	Vested		-			-
	Forfeited		-			-
	Restricted stock outstanding at March 31, 2014		31,693		$	78.59
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]	'
		Three Months Ended March 31,
		2014			2013
	Risk-free interest rate		0.11	%		0.13	%
	Expected life (months)		6			6
	Expected volatility		39.8	%		53.14	%
	Expected dividend yield		0	%		0	%

Note_7_Accumulated_Other_Compr1

Note 7 - Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2014
Partners' Capital, Comprehensive Income [Abstract]	'
Comprehensive Income (Loss) [Table Text Block]	'
		Three Months Ended
		March 31,
	(in thousands)	2014			2013
	Foreign currency translation adjustment, net of tax
	Balance at beginning of period	$	(1,091	)	$	(928	)
	Other comprehensive income before reclassifications		172			(907	)
	Amounts reclassified from accumulated other comprehensive income		-			-
	Net current-period other comprehensive income		172			(907	)
	Balance at end of period	$	(919	)	$	(1,835	)

Note_9_Revenue_and_Geographic_1

Note 9 - Revenue and Geographic Information (Tables)	3 Months Ended
	Mar. 31, 2014
Segment Reporting [Abstract]	'
Revenue from External Customers by Products and Services [Table Text Block]	'
		Three Months Ended March 31,
	(in thousands)	2014		2013
	Revenue:
	Protomold	$	32,694	$	26,880
	Firstcut		13,380		10,433
	Total revenue	$	46,074	$	37,313
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]	'
		Three Months Ended March 31,
	(in thousands)	2014		2013
	Revenue:
	United States	$	33,022	$	28,148
	International		13,052		9,165
	Total revenue	$	46,074	$	37,313
Long-lived Assets by Geographic Areas [Table Text Block]	'
	(in thousands)	March 31,		December 31,
		2014		2013
	Long-lived assets:
	United States	$	55,897	$	48,381
	International		8,066		7,720
	Total long-lived assets	$	63,963	$	56,101

Note_2_Net_Income_per_Common_S2

Note 2 - Net Income per Common Share (Details) - Computation of Basic and Diluted Net Income per Share (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Computation of Basic and Diluted Net Income per Share [Abstract]	'	'
Net income (in Dollars)	$10,102	$8,287
Basic - weighted-average shares outstanding:	25,573,851	25,014,907
Effect of dilutive securities:	'	'
Employee stock options and other	517,218	630,837
Diluted - weighted-average shares outstanding:	26,091,069	25,645,744
Net income per share:	'	'
Basic (in Dollars per share)	$0.40	$0.33
Diluted (in Dollars per share)	$0.39	$0.32

Note_3_Fair_Value_Measurements2

Note 3 - Fair Value Measurements (Details) - Fair Value of Financial Assets Measured on a Recurring Basis (Fair Value, Measurements, Recurring [Member], Fair Value, Inputs, Level 1 [Member], USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]	'	'
Cash and cash equivalents	'	'
Money market mutual fund	$14,339	$5,524
Total	$14,339	$5,524

Note_4_Marketable_Securities_D

Note 4 - Marketable Securities (Details) - Short-Term and Long-Term Marketable Securities (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	$105,675	$100,362
Unrealized Gains	99	86
Unrealized Losses	-166	-72
Fair Value	105,608	100,376
US Government Agencies Debt Securities [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	24,476	21,713
Unrealized Gains	1	2
Unrealized Losses	-63	-22
Fair Value	24,414	21,693
Corporate Debt Securities [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	37,314	29,480
Unrealized Gains	30	30
Unrealized Losses	-76	-20
Fair Value	37,268	29,490
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	1,996	'
Unrealized Losses	-15	'
Fair Value	1,981	'
US States and Political Subdivisions Debt Securities [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	36,949	44,474
Unrealized Gains	60	49
Unrealized Losses	-10	-22
Fair Value	36,999	44,501
Bank Time Deposits [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	4,940	4,695
Unrealized Gains	8	5
Unrealized Losses	-2	-8
Fair Value	$4,946	$4,692

Note_4_Marketable_Securities_D1

Note 4 - Marketable Securities (Details) - Balance of Held-to-Maturity Debt Securities by Contractual Maturity (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Balance of Held-to-Maturity Debt Securities by Contractual Maturity [Abstract]	'	'
Due in one year or less	$34,360	'
Due after one year through five years	71,315	'
Total marketable securities	$105,675	$100,362

Note_5_Inventory_Details_The_C

Note 5 - Inventory (Details) - The Companybs Inventory (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
The Companybs Inventory [Abstract]	'	'
Raw materials	$4,996	$4,875
Work in process	535	410
Total inventory	5,531	5,285
Allowance for obsolescence	-185	-119
Inventory, net of allowance	$5,346	$5,166

Note_6_StockBased_Compensation2

Note 6 - Stock-Based Compensation (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Note 6 - Stock-Based Compensation (Details) [Line Items]	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	'10 years	'
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date	15.00%	'
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period	'6 months	'
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent	85.00%	'
Share-based Compensation	$998,000	$865,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$39.85	'
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	9,000,000	'
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	'3 years 292 days	'
Employee Stock Option [Member]	'	'
Note 6 - Stock-Based Compensation (Details) [Line Items]	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	'5 years	'
Restricted Stock [Member]	'	'
Note 6 - Stock-Based Compensation (Details) [Line Items]	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$78.59	'
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	'4 years 6 months	'
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$2,400,000	'

Note_6_StockBased_Compensation3

Note 6 - Stock-Based Compensation (Details) - Stock Option Activity (USD $)	3 Months Ended
	Mar. 31, 2014
Stock Option Activity [Abstract]	'
Options outstanding at December 31, 2013	1,143,250
Options outstanding at December 31, 2013	$19.03
Granted	69,350
Granted	$78.59
Exercised	-47,255
Exercised	$14.06
Forfeited	-804
Forfeited	$30.58
Options outstanding at March 31, 2014	1,164,541
Options outstanding at March 31, 2014	$22.77
Exercisable at March 31, 2014	434,412
Exercisable at March 31, 2014	$10.99

Note_6_StockBased_Compensation4

Note 6 - Stock-Based Compensation (Details) - Assumptions Used in the Black-Scholes Option Pricing Model (Employee Stock Option [Member])	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Employee Stock Option [Member]	'	'
Note 6 - Stock-Based Compensation (Details) - Assumptions Used in the Black-Scholes Option Pricing Model [Line Items]	'	'
Risk-free interest rate	2.14%	1.27%
Expected life (years)	'6 years 6 months	'6 years 6 months
Expected volatility	49.30%	53.54%
Expected dividend yield	0.00%	0.00%

Note_6_StockBased_Compensation5

Note 6 - Stock-Based Compensation (Details) - Non-Vested Restricted Stock Options (USD $)	3 Months Ended
	Mar. 31, 2014
Note 6 - Stock-Based Compensation (Details) - Non-Vested Restricted Stock Options [Line Items]	'
Granted	69,350
Granted (in Dollars per share)	$39.85
Restricted Stock [Member]	'
Note 6 - Stock-Based Compensation (Details) - Non-Vested Restricted Stock Options [Line Items]	'
Restricted stock outstanding at December 31, 2013	0
Restricted stock outstanding at December 31, 2013 (in Dollars per share)	$0
Granted	31,693
Granted (in Dollars per share)	$78.59
Vested	0
Forfeited	0
Restricted stock outstanding at March 31, 2014	31,693
Restricted stock outstanding at March 31, 2014 (in Dollars per share)	$78.59

Note_6_StockBased_Compensation6

Note 6 - Stock-Based Compensation (Details) - Assumptions Used to Estimate the Fair Value of the ESPP (ESPP [Member])	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
ESPP [Member]	'	'
Note 6 - Stock-Based Compensation (Details) - Assumptions Used to Estimate the Fair Value of the ESPP [Line Items]	'	'
Risk-free interest rate	0.11%	0.13%
Expected life (months)	'6 years	'6 years
Expected volatility	39.80%	53.14%
Expected dividend yield	0.00%	0.00%

Note_7_Accumulated_Other_Compr2

Note 7 - Accumulated Other Comprehensive Income (Details) - Other Comprehensive Income (Loss) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Foreign currency translation adjustment, net of tax	'	'
Balance at beginning of period	($1,091)	($928)
Other comprehensive income before reclassifications	172	-907
Net current-period other comprehensive income	172	-907
Balance at end of period	($919)	($1,835)

Note_8_Income_Taxes_Details

Note 8 - Income Taxes (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'	'	'
Income Tax Expense (Benefit)	$4,449,000	$3,110,000	'
Effective Income Tax Rate Reconciliation, Percent	30.60%	27.30%	'
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	'	'
Income Tax Credits and Adjustments	'	300,000	'
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	'	3.00%	'
Unrecognized Tax Benefits	700,000	'	700,000
Unrecognized Tax Benefits, Period Increase (Decrease)	$0	$0	'

Note_9_Revenue_and_Geographic_2

Note 9 - Revenue and Geographic Information (Details) - Total Revenue by Product Line (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenue:	'	'
Revenue	$46,074	$37,313
Protomold [Member]	'	'
Revenue:	'	'
Revenue	32,694	26,880
First Cut [Member]	'	'
Revenue:	'	'
Revenue	$13,380	$10,433

Note_9_Revenue_and_Geographic_3

Note 9 - Revenue and Geographic Information (Details) - Revenue to External Customers and Long-Lived Assets by Geography (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenue:	'	'
Revenue	$46,074	$37,313
UNITED STATES	'	'
Revenue:	'	'
Revenue	33,022	28,148
International [Member]	'	'
Revenue:	'	'
Revenue	$13,052	$9,165

Note_9_Revenue_and_Geographic_4

Note 9 - Revenue and Geographic Information (Details) - Long-lived Assets by Geographic Region (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Long-lived assets:	'	'
Long-lived Assets	$63,963	$56,101
UNITED STATES	'	'
Long-lived assets:	'	'
Long-lived Assets	55,897	48,381
International [Member]	'	'
Long-lived assets:	'	'
Long-lived Assets	$8,066	$7,720

Note_10_Subsequent_Events_Deta

Note 10 - Subsequent Events (Details) (Subsequent Event [Member], FineLine Prototyping, Inc. [Member], USD $)	1 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2014
Subsequent Event [Member] | FineLine Prototyping, Inc. [Member]	'
Note 10 - Subsequent Events (Details) [Line Items]	'
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Business Combination, Consideration Transferred	$37
Payments to Acquire Businesses, Gross	34
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$3