Annual report pursuant to Section 13 and 15(d)


Cover - USD ($)
$ in Billions
12 Months Ended
Dec. 31, 2020
Feb. 24, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K/A    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Current Fiscal Year End Date --12-31    
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, 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 Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 1.5
Entity Common Stock, Shares Outstanding   67,192,898  
Documents Incorporated by Reference None.    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001065332