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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Revenue     $ 30,952 $ 22,529
Selling, general and administrative expenses $ 4,723 $ 4,401 12,874 13,328
Depreciation and amortization 544 486 2,040 1,551
Income from operations 2,782 1,651 16,038 7,650
Other miscellaneous (expense) income (26) 724 (2,047) 4,570
Interest income 49 127 247 413
Interest and other financing expense (112) (90) (368) (157)
Net income before income taxes 2,693 2,412 13,870 12,476
Provision for income taxes 49 227 1,895 635
Net income from continuing operations 2,644 2,185 11,975 11,841
Income from discontinued operations, net of tax 74 9 483 9
Net income $ 2,718 $ 2,194 $ 12,458 $ 11,850
Basic earnings per share        
Continuing operations (in dollars per share) $ 0.19 $ 0.16 $ 0.87 $ 0.88
Discontinued operations (in dollars per share) 0.01 0 0.04 0
Total (in dollars per share) 0.20 0.16 0.91 0.88
Diluted earnings per share        
Continuing operations (in dollars per share) 0.19 0.16 0.87 0.87
Discontinued operations (in dollars per share) 0.01 0 0.04 0
Total (in dollars per share) $ 0.20 $ 0.16 $ 0.91 $ 0.87
Weighted average shares outstanding        
Basic (in shares) 13,676 13,514 13,654 13,494
Diluted (in shares) 13,741 13,635 13,721 13,606
Royalty [Member]        
Revenue $ 7,671 $ 6,067 $ 28,897 $ 21,317
Service [Member]        
Revenue $ 378 $ 471 $ 2,055 $ 1,212