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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Revenue $ 8,419 $ 9,857
Selling, general and administrative expenses 5,619 5,844
Depreciation and amortization 698 697
Income from operations 2,102 3,316
Other miscellaneous income 37 43
Interest income 136 46
Interest and other financing expense (243) (540)
Net income before income taxes 2,032 2,865
Provision for income taxes 340 547
Net income from continuing operations 1,692 2,318
(Loss) income from discontinued operations, net of tax (73) 312
Net income $ 1,619 $ 2,630
Basic earnings (loss) per share    
Continuing operations (in dollars per share) $ 0.12 $ 0.17
Discontinued operations (in dollars per share) 0 0.02
Total (in dollars per share) 0.12 0.19
Diluted earnings (loss) per share    
Continuing operations (in dollars per share) 0.12 0.17
Discontinued operations (in dollars per share) 0 0.02
Total (in dollars per share) $ 0.12 $ 0.19
Weighted average shares outstanding    
Basic (in shares) 13,800 13,707
Diluted (in shares) 13,886 13,782
Royalty [Member]    
Revenue $ 7,831 $ 9,323
Service [Member]    
Revenue $ 588 $ 534