COVER - shares	6 Months Ended
	Jun. 30, 2020	Jul. 24, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity File Number	000-26621
Entity Registrant Name	NIC INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	52-2077581
Entity Address, Address Line One	25501 West Valley Parkway
Entity Address, Address Line Two	Suite 300
Entity Address, City or Town	Olathe
Entity Address, State or Province	KS
Entity Address, Postal Zip Code	66061
City Area Code	877
Local Phone Number	234-3468
Title of 12(b) Security	Common Stock, $0.0001 par value per share
Trading Symbol	EGOV
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		67,021,356
Entity Central Index Key	0001065332
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Amendment Flag	false