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Pay vs Performance Disclosure - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pay vs Performance Disclosure [Table]      
Pay vs Performance [Table Text Block]
PAY VERSUS PERFORMANCE
Year
 ​ ​
Summary
Compensation
Table Total to
PEO(1)
($)
 ​ ​
Compensation
Actually Paid
to PEO(3)
($)
 ​ ​
Average
Summary
Compensation
Table Total
for Non-PEO
NEOs (2)
($)
 ​ ​
Average
Compensation
Actually Paid
to Non-PEO
NEOs(2)(3)
($)
 ​ ​
Value of Initial
Fixed $100
Investment Based
on:
 ​ ​
Net Income
($)
 ​ ​




Adjusted Income Before Income Taxes(5)
($)
​
Total
Share-
holder
Return(4)
($)
 ​ ​
S&P
Healthcare
Index Total
Shareholder
Return(4)
($)
 ​
2022
 ​ ​
1,159,207
 ​ ​
1,048,455
 ​ ​
696,866
 ​ ​
600,179
 ​ ​
75.58
 ​ ​
140.30
 ​ ​
22,445,000
 ​ ​
45,505,000
2021
 ​ ​
2,249,445
 ​ ​
2,132,097
 ​ ​
1,288,949
 ​ ​
1,157,347
 ​ ​
83.43
 ​ ​
143.09
 ​ ​
138,590,000
 ​ ​
163,404,000
2020
 ​ ​
1,278,366
 ​ ​
786,671
 ​ ​
760,448
 ​ ​
370,710
 ​ ​
79.20
 ​ ​
113.45
 ​ ​
41,871,000
 ​ ​
76,270,000

(1)
The principal executive officer (“PEO”) for each of the covered fiscal years is Stephen F. Flatt, who began serving as our Chief Executive Officer (“CEO”) in January 2017.
(2)
The non-PEO Named Executive Officers (“NEO's”) represent the following individuals for each of the years shown:
2022 - B. Anderson Flatt, Senior Vice President and Chief Information Officer; Brian F. Kidd, Senior Vice President, Controller, and Principal Accounting Officer; Josh A. McCreary, Senior Vice President, General Counsel, and Secretary; R. Michael Ussery, President and Chief Operating Officer.
2021 and 2020 - B. Anderson Flatt, Senior Vice President and Chief Information Officer; Brian F. Kidd, Senior Vice President, Controller, and Principal Accounting Officer; Jeffrey R. Smith, Senior Vice President and Treasurer; R. Michael Ussery, President and Chief Operating Officer.
(3)
To calculate Compensation Actually Paid (“CAP”) to the Chief Executive Officer and the average CAP to the other NEO’s, the following adjustments were made to Summary Compensation Table (“SCT”) total compensation for each year shown. The fair value of stock awards includes the value of both restricted stock awards and stock option awards (in $’s):
 
 ​ ​
 
 ​ ​
Additions
​ ​
Deductions
​ ​
 
Year
 ​ ​
Summary
Compensation
Table
($)
 ​ ​
Fair Value of
Stock Awards
Granted
During the
Year,
Outstanding
and Unvested
at Year-End
($)
 ​ ​
Change in
Value of
Stock Awards
Granted in
Any Prior
Year,
Outstanding
and Unvested
at Year-End
($)
 ​ ​
Change in
Value of
Stock
Awards
Granted in
Any Prior
Year, Vested
During the
Year
($)
 ​ ​
Fair Value
of Awards
Forfeited
in Fiscal
Year
($)
 ​ ​
Dividends
Paid in
Fiscal Year
on
Unvested
Awards
($)
 ​ ​
Stock
Awards
Reported in
SCT
($)
 ​ ​
Option
Awards
Reported in
SCT
($)
 ​ ​
Compensation
Actually Paid
($)
Principal Executive Officer
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
2022
 ​ ​
1,159,207
 ​ ​
179,539
 ​ ​
(55,113)
 ​ ​
(11,060)
 ​ ​
—
 ​ ​
11,987
 ​ ​
(81,018)
 ​ ​
(155,087)
 ​ ​
1,048,455
2021
 ​ ​
2,249,445
 ​ ​
326,112
 ​ ​
(18,021)
 ​ ​
—
 ​ ​
—
 ​ ​
12,699
 ​ ​
(319,008)
 ​ ​
(119,130)
 ​ ​
2,132,097
2020
 ​ ​
1,278,366
 ​ ​
109,577
 ​ ​
(376,385)
 ​ ​
—
 ​ ​
—
 ​ ​
12,052
 ​ ​
(117,808)
 ​ ​
(119,130)
 ​ ​
786,671
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
Average for Other NEO’s
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
2022
 ​ ​
696,866
 ​ ​
125,341
 ​ ​
(29,711)
 ​ ​
(25,350)
 ​ ​
—
 ​ ​
6,445
 ​ ​
(46,995)
 ​ ​
(126,418)
 ​ ​
600,179
2021
 ​ ​
1,288,949
 ​ ​
181,502
 ​ ​
(55,529)
 ​ ​
—
 ​ ​
—
 ​ ​
11,411
 ​ ​
(177,548)
 ​ ​
(91,438)
 ​ ​
1,157,347
2020
 ​ ​
760,448
 ​ ​
60,964
 ​ ​
(303,801)
 ​ ​
—
 ​ ​
—
 ​ ​
9,532
 ​ ​
(65,575)
 ​ ​
(90,859)
 ​ ​
370,710
(4)
The comparison of total shareholder returns (“TSR”) assumes that $100 was invested on December 31, 2019, in NHC and the S&P Healthcare Index, and that dividends were reinvested when and as paid. The selected peer group is the S&P Healthcare Index.
(5)
Our company-selected measure, which is the measure we believe represents the most important financial performance not otherwise presented in the table above that we use to link CAP to our Company's performance is adjusted income before income taxes, a non-GAAP measure. This measure takes income before income taxes and adds or subtracts the unrealized gain or losses on marketable equity securities, plus adds or subtracts the net income or loss attributable to noncontrolling interest.
   
Company Selected Measure Name Adjusted Income Before Income Taxes    
Named Executive Officers, Footnote [Text Block]
(2)
The non-PEO Named Executive Officers (“NEO's”) represent the following individuals for each of the years shown:
2022 - B. Anderson Flatt, Senior Vice President and Chief Information Officer; Brian F. Kidd, Senior Vice President, Controller, and Principal Accounting Officer; Josh A. McCreary, Senior Vice President, General Counsel, and Secretary; R. Michael Ussery, President and Chief Operating Officer.
2021 and 2020 - B. Anderson Flatt, Senior Vice President and Chief Information Officer; Brian F. Kidd, Senior Vice President, Controller, and Principal Accounting Officer; Jeffrey R. Smith, Senior Vice President and Treasurer; R. Michael Ussery, President and Chief Operating Officer.
    
Peer Group Issuers, Footnote [Text Block]
(4)
The comparison of total shareholder returns (“TSR”) assumes that $100 was invested on December 31, 2019, in NHC and the S&P Healthcare Index, and that dividends were reinvested when and as paid. The selected peer group is the S&P Healthcare Index.
   
PEO Total Compensation Amount $ 1,159,207 $ 2,249,445 $ 1,278,366
PEO Actually Paid Compensation Amount $ 1,048,455 2,132,097 786,671
Adjustment To PEO Compensation, Footnote [Text Block]
(3)
To calculate Compensation Actually Paid (“CAP”) to the Chief Executive Officer and the average CAP to the other NEO’s, the following adjustments were made to Summary Compensation Table (“SCT”) total compensation for each year shown. The fair value of stock awards includes the value of both restricted stock awards and stock option awards (in $’s):
 
 ​ ​
 
 ​ ​
Additions
​ ​
Deductions
​ ​
 
Year
 ​ ​
Summary
Compensation
Table
($)
 ​ ​
Fair Value of
Stock Awards
Granted
During the
Year,
Outstanding
and Unvested
at Year-End
($)
 ​ ​
Change in
Value of
Stock Awards
Granted in
Any Prior
Year,
Outstanding
and Unvested
at Year-End
($)
 ​ ​
Change in
Value of
Stock
Awards
Granted in
Any Prior
Year, Vested
During the
Year
($)
 ​ ​
Fair Value
of Awards
Forfeited
in Fiscal
Year
($)
 ​ ​
Dividends
Paid in
Fiscal Year
on
Unvested
Awards
($)
 ​ ​
Stock
Awards
Reported in
SCT
($)
 ​ ​
Option
Awards
Reported in
SCT
($)
 ​ ​
Compensation
Actually Paid
($)
Principal Executive Officer
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
2022
 ​ ​
1,159,207
 ​ ​
179,539
 ​ ​
(55,113)
 ​ ​
(11,060)
 ​ ​
—
 ​ ​
11,987
 ​ ​
(81,018)
 ​ ​
(155,087)
 ​ ​
1,048,455
2021
 ​ ​
2,249,445
 ​ ​
326,112
 ​ ​
(18,021)
 ​ ​
—
 ​ ​
—
 ​ ​
12,699
 ​ ​
(319,008)
 ​ ​
(119,130)
 ​ ​
2,132,097
2020
 ​ ​
1,278,366
 ​ ​
109,577
 ​ ​
(376,385)
 ​ ​
—
 ​ ​
—
 ​ ​
12,052
 ​ ​
(117,808)
 ​ ​
(119,130)
 ​ ​
786,671
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
Average for Other NEO’s
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
2022
 ​ ​
696,866
 ​ ​
125,341
 ​ ​
(29,711)
 ​ ​
(25,350)
 ​ ​
—
 ​ ​
6,445
 ​ ​
(46,995)
 ​ ​
(126,418)
 ​ ​
600,179
2021
 ​ ​
1,288,949
 ​ ​
181,502
 ​ ​
(55,529)
 ​ ​
—
 ​ ​
—
 ​ ​
11,411
 ​ ​
(177,548)
 ​ ​
(91,438)
 ​ ​
1,157,347
2020
 ​ ​
760,448
 ​ ​
60,964
 ​ ​
(303,801)
 ​ ​
—
 ​ ​
—
 ​ ​
9,532
 ​ ​
(65,575)
 ​ ​
(90,859)
 ​ ​
370,710
   
Non-PEO NEO Average Total Compensation Amount $ 696,866 1,288,949 760,448
Non-PEO NEO Average Compensation Actually Paid Amount $ 600,179 1,157,347 370,710
Adjustment to Non-PEO NEO Compensation Footnote [Text Block]
(3)
To calculate Compensation Actually Paid (“CAP”) to the Chief Executive Officer and the average CAP to the other NEO’s, the following adjustments were made to Summary Compensation Table (“SCT”) total compensation for each year shown. The fair value of stock awards includes the value of both restricted stock awards and stock option awards (in $’s):
 
 ​ ​
 
 ​ ​
Additions
​ ​
Deductions
​ ​
 
Year
 ​ ​
Summary
Compensation
Table
($)
 ​ ​
Fair Value of
Stock Awards
Granted
During the
Year,
Outstanding
and Unvested
at Year-End
($)
 ​ ​
Change in
Value of
Stock Awards
Granted in
Any Prior
Year,
Outstanding
and Unvested
at Year-End
($)
 ​ ​
Change in
Value of
Stock
Awards
Granted in
Any Prior
Year, Vested
During the
Year
($)
 ​ ​
Fair Value
of Awards
Forfeited
in Fiscal
Year
($)
 ​ ​
Dividends
Paid in
Fiscal Year
on
Unvested
Awards
($)
 ​ ​
Stock
Awards
Reported in
SCT
($)
 ​ ​
Option
Awards
Reported in
SCT
($)
 ​ ​
Compensation
Actually Paid
($)
Principal Executive Officer
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
2022
 ​ ​
1,159,207
 ​ ​
179,539
 ​ ​
(55,113)
 ​ ​
(11,060)
 ​ ​
—
 ​ ​
11,987
 ​ ​
(81,018)
 ​ ​
(155,087)
 ​ ​
1,048,455
2021
 ​ ​
2,249,445
 ​ ​
326,112
 ​ ​
(18,021)
 ​ ​
—
 ​ ​
—
 ​ ​
12,699
 ​ ​
(319,008)
 ​ ​
(119,130)
 ​ ​
2,132,097
2020
 ​ ​
1,278,366
 ​ ​
109,577
 ​ ​
(376,385)
 ​ ​
—
 ​ ​
—
 ​ ​
12,052
 ​ ​
(117,808)
 ​ ​
(119,130)
 ​ ​
786,671
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
Average for Other NEO’s
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
2022
 ​ ​
696,866
 ​ ​
125,341
 ​ ​
(29,711)
 ​ ​
(25,350)
 ​ ​
—
 ​ ​
6,445
 ​ ​
(46,995)
 ​ ​
(126,418)
 ​ ​
600,179
2021
 ​ ​
1,288,949
 ​ ​
181,502
 ​ ​
(55,529)
 ​ ​
—
 ​ ​
—
 ​ ​
11,411
 ​ ​
(177,548)
 ​ ​
(91,438)
 ​ ​
1,157,347
2020
 ​ ​
760,448
 ​ ​
60,964
 ​ ​
(303,801)
 ​ ​
—
 ​ ​
—
 ​ ​
9,532
 ​ ​
(65,575)
 ​ ​
(90,859)
 ​ ​
370,710
   
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
graphic
 
    
Compensation Actually Paid vs. Net Income [Text Block]
The graphs below depict the relationship between each of the financial performance measures in the pay versus performance table above and CAP to our CEO and, on average, to our other NEO’s, for each of the three years ended December 31, 2022.
graphic
 
    
Compensation Actually Paid vs. Company Selected Measure [Text Block]
The graphs below depict the relationship between each of the financial performance measures in the pay versus performance table above and CAP to our CEO and, on average, to our other NEO’s, for each of the three years ended December 31, 2022.
graphic
 
    
Total Shareholder Return Vs Peer Group [Text Block]
graphic
 
    
Tabular List [Table Text Block]
Performance Measures

The financial performance measures which we believe are most important to link compensation actually paid to each of our Named Executive Officers for the fiscal year ended December 31, 2022, to our performance are:
Net Income
Adjusted Income Before Income Taxes

Adjusted Income Before Income Taxes is calculated by beginning with the income before income taxes line item in the consolidated statements of operations and adding: (i) the unrealized gains or losses on marketable equity securities and (ii) net income or loss attributable to noncontrolling interest.
   
Total Shareholder Return Amount $ 75.58 83.43 79.2
Peer Group Total Shareholder Return Amount 140.3 143.09 113.45
Net Income (Loss) $ 22,445,000 $ 138,590,000 $ 41,871,000
Company Selected Measure Amount 45,505,000 163,404,000 76,270,000
PEO Name Stephen F. Flatt Stephen F. Flatt Stephen F. Flatt
Measure [Axis]: 1      
Pay vs Performance Disclosure [Table]      
Measure Name Net Income    
Measure [Axis]: 2      
Pay vs Performance Disclosure [Table]      
Measure Name Adjusted Income Before Income Taxes    
Non-GAAP Measure Description [Text Block]
(5)
Our company-selected measure, which is the measure we believe represents the most important financial performance not otherwise presented in the table above that we use to link CAP to our Company's performance is adjusted income before income taxes, a non-GAAP measure. This measure takes income before income taxes and adds or subtracts the unrealized gain or losses on marketable equity securities, plus adds or subtracts the net income or loss attributable to noncontrolling interest.
   
PEO [Member] | Additions Fair Value of Stock Awards Granted During the Year Outstanding and Unvested at Year End [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ 179,539 $ 326,112 $ 109,577
PEO [Member] | Additions Change in Value of Stock Awards Granted in Any Prior Year Outstanding and Unvested at Year End [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (55,113) (18,021) (376,385)
PEO [Member] | Additions Change in Value of Stock Awards Granted in Any Prior Year Vested During the Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (11,060) 0 0
PEO [Member] | Additions Fair Value of Awards Forfeited in Fiscal Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0 0
PEO [Member] | Additions Dividends Paid in Fiscal Year on Unvested Awards [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 11,987 12,699 12,052
PEO [Member] | Deductions Stock Awards Reported in SCT [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (81,018) (319,008) (117,808)
PEO [Member] | Deductions Option Awards Reported in SCT [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (155,087) (119,130) (119,130)
Non-PEO NEO [Member] | Additions Fair Value of Stock Awards Granted During the Year Outstanding and Unvested at Year End [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 125,341 181,502 60,964
Non-PEO NEO [Member] | Additions Change in Value of Stock Awards Granted in Any Prior Year Outstanding and Unvested at Year End [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (29,711) (55,529) (303,801)
Non-PEO NEO [Member] | Additions Change in Value of Stock Awards Granted in Any Prior Year Vested During the Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (25,350) 0 0
Non-PEO NEO [Member] | Additions Fair Value of Awards Forfeited in Fiscal Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0 0
Non-PEO NEO [Member] | Additions Dividends Paid in Fiscal Year on Unvested Awards [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 6,445 11,411 9,532
Non-PEO NEO [Member] | Deductions Stock Awards Reported in SCT [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (46,995) (177,548) (65,575)
Non-PEO NEO [Member] | Deductions Option Awards Reported in SCT [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ (126,418) $ (91,438) $ (90,859)