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Note 11 - Segment Reporting - Segment Information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Assets $ 35,957,676 $ 46,166,000 $ 35,957,676 $ 46,166,000 $ 40,935,925
Revenue 4,329,459 3,993,204 11,729,727 13,748,448  
Operating (loss) income (922,324) (1,392,653) (3,624,035) (2,416,745)  
Pretax (loss) income 6,000,731 (1,291,641) 5,966,670 (2,297,186)  
Segment Reconciling Items [Member]          
Assets [1] 2,000   2,000    
Intersegment Eliminations [Member]          
Assets [1]   0   0  
Revenue [1] (7,000) (131,000) (122,000) (390,000)  
Operating (loss) income [1] (727,000) (738,000) (2,425,000) (2,229,000)  
Pretax (loss) income [1] (727,000) (738,000) (2,425,000) (2,229,000)  
CVD [Member] | Operating Segments [Member]          
Assets 27,248,000 34,888,000 27,248,000 34,888,000  
Revenue 2,074,000 2,308,000 5,884,000 8,686,000  
Operating (loss) income (911,000) (283,000) (2,664,000) 10,000  
Pretax (loss) income (920,000) (267,000) (259,000) 10,000  
SDC [Member] | Operating Segments [Member]          
Assets 7,053,000 6,202,000 7,053,000 6,202,000  
Revenue 1,326,000 826,000 3,314,000 3,661,000  
Operating (loss) income 275,000 (111,000) 637,000 556,000  
Pretax (loss) income 275,000 (111,000) 637,000 564,000  
Materials [Member] | Operating Segments [Member]          
Assets 1,655,000 5,076,000 1,655,000 5,076,000  
Revenue 937,000 990,000 2,654,000 1,791,000  
Operating (loss) income 441,000 (261,000) 828,000 (754,000)  
Pretax (loss) income $ 7,373,000 $ (176,000) $ 8,014,000 $ (642,000)  
[1] All elimination entries represent intersegment revenues eliminated in consolidation for external financial reporting.