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Company’s business segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Revenues $ 37,481 $ 31,220 $ 23,583
Operating profit before corporate expenses 11,658 5,345 8,645
Corporate expenses (3,662) (3,071) (3,511)
Operating profit 7,996 2,274 5,134
Interest expense 3,045 2,304 1,100
Depreciation, depletion and amortization 11,462 12,946 6,050
Capital expenditures 27,615 16,530 17,544
Asset Management [Member]      
Segment Reporting Information [Line Items]      
Revenues 3,681 2,575 2,747
Operating profit before corporate expenses 1,592 612 907
Corporate expenses (632) (843) (909)
Depreciation, depletion and amortization 907 578 652
Capital expenditures 1,284 852 924
Mining Properties [Member]      
Segment Reporting Information [Line Items]      
Revenues 10,683 9,465 9,477
Operating profit before corporate expenses 9,305 8,558 8,629
Corporate expenses (414) (318) (288)
Depreciation, depletion and amortization 586 199 218
Capital expenditures 11,218 522 0
Development [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,674 1,563 1,152
Operating profit before corporate expenses (2,791) (2,548) (2,576)
Corporate expenses (2,284) (1,557) (2,108)
Depreciation, depletion and amortization 189 208 214
Capital expenditures 14,521 14,242 16,547
Stabilized Joint Venture [Member]      
Segment Reporting Information [Line Items]      
Revenues 21,443 17,617 10,207
Operating profit before corporate expenses 3,552 (1,277) 1,685
Corporate expenses (332) (353) (206)
Depreciation, depletion and amortization 9,535 11,752 4,744
Capital expenditures 592 914 73
Total Segments [Member]      
Segment Reporting Information [Line Items]      
Depreciation, depletion and amortization $ 11,217 $ 12,737 $ 5,828