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Note 12 - Segment Reporting - Segment Information (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Assets $ 39,205,534 $ 48,794,000 $ 40,935,925
Assets (39,205,534) (48,794,000) $ (40,935,925)
Revenue 3,365,860 6,036,360  
Operating loss (1,618,787) 108,161  
Pretax (loss) income (1,505,550) 127,834  
Intersegment Eliminations [Member]      
Assets [1] (24,000) (9,000)  
Assets [1] 24,000 9,000  
Revenue [1] (96,000) (164,000)  
Operating loss [1] (929,000) (730,000)  
Pretax (loss) income (929,000) [1] 128,000  
Corporate, Non-Segment [Member]      
Pretax (loss) income   (730,000)  
CVD [Member] | Operating Segments [Member]      
Assets 29,659,000 36,699,000  
Assets (29,659,000) (36,699,000)  
Revenue 2,006,000 4,097,000  
Operating loss (575,000) 592,000  
Pretax (loss) income (590,000) 589,000  
SDC [Member] | Operating Segments [Member]      
Assets 6,116,000 6,451,000  
Assets (6,116,000) (6,451,000)  
Revenue 827,000 1,819,000  
Operating loss (5,000) 603,000  
Pretax (loss) income (5,000) 610,000  
Materials [Member] | Operating Segments [Member]      
Assets 3,407,000 5,653,000  
Assets (3,407,000) (5,653,000)  
Revenue 629,000 284,000  
Operating loss (110,000) (357,000)  
Pretax (loss) income $ 18,000 $ (341,000)  
[1] All elimination entries represent intersegment revenues eliminated in consolidation for external financial reporting.