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Note 11 - Segment Reporting - Segment Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Assets $ 34,115,515 $ 38,920,000 $ 34,115,515 $ 38,920,000 $ 35,524,229
Revenue from Contract with Customer, Including Assessed Tax 5,808,588 4,034,408 10,460,820 7,400,268  
Operating (loss) income (856,845) (1,082,924) (1,867,123) (2,701,711)  
Pretax (loss) income (838,577) 1,471,489 (1,835,917) (34,061)  
Segment Reconciling Items [Member]          
Assets 68,000 66,000 68,000 66,000  
Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax (380,000) (19,000) (425,000) (114,000)  
Operating (loss) income (758,000) (734,000) (1,438,000) (1,704,000)  
Pretax (loss) income (758,000) (734,000) (1,438) (1,704,000)  
CVD [Member] | Operating Segments [Member]          
Assets 23,661,000 28,149,000 23,661,000 28,149,000  
Revenue from Contract with Customer, Including Assessed Tax 3,782,000 1,804,000 6,607,000 3,811,000  
Operating (loss) income (469,000) (1,220,000) (1,236,000) (1,753,000)  
Pretax (loss) income (451,000) 1,209,000 (1,204,000) 661,000  
SDC [Member] | Operating Segments [Member]          
Assets 8,474,000 6,765,000 8,474,000 6,765,000  
Revenue from Contract with Customer, Including Assessed Tax 1,591,000 1,162,000 3,006,000 1,987,000  
Operating (loss) income 227,000 368,000 670,000 363,000  
Pretax (loss) income 227,000 368,000 670,000 363,000  
SDC [Member] | Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax 400,000 20,000.00 400,000 100,000  
Materials [Member] | Operating Segments [Member]          
Assets 1,913,000 3,940,000 1,913,000 3,940,000  
Revenue from Contract with Customer, Including Assessed Tax 816,000 1,087,000 1,273,000 1,716,000  
Operating (loss) income 143,000 503,000 137,000 392,000  
Pretax (loss) income $ 143,000 $ 628,000 $ 136,000 $ 646,000