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Note 3 - Property and Equipment (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization $ 81,227,000  
Depreciation 5,165,000 $ 4,783,000
Net Income (Loss) Attributable to Parent $ 610,000 $ 1,328,000
Earnings Per Share, Diluted (in dollars per share) $ 0.1 $ 0.21
Gain (Loss) on Sale of Assets and Asset Impairment Charges $ (940,000) $ (0)
Asset Impairment Charges 650,000  
PBRT Equipment [Member]    
Asset Impairment Charges 0 0
Salvage Value [Member]    
Net Income (Loss) Attributable to Parent $ (207,000)  
Earnings Per Share, Diluted (in dollars per share) $ 0.03  
Non-US [Member]    
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization $ 3,966,000 $ 2,201,000