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Note 5 - Segment Information - Reportable Segments (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Net sales $ 4,743,452 $ 3,134,984 $ 12,068,208 $ 9,204,615  
Cost of goods sold 3,161,362 2,261,205 8,060,482 6,792,709  
Gross profit (loss) 1,582,090 873,779 4,007,726 2,411,906  
Selling general and administrative* [1] 2,274,054 979,773 5,402,147 3,963,100  
Research and development* [1] 134,608 136,520 398,425 521,334  
Income (loss) from operations (826,572) (242,514) (1,792,846) (2,072,528)  
Trade receivables 1,875,177   1,875,177   $ 2,119,213
Segment Reconciling Items [Member]          
Net sales 0 0 0 0  
Cost of goods sold 0 0 0 0  
Gross profit (loss) 0 0 0 0  
Selling general and administrative* [1] 1,557,421 485,393 3,482,299 1,948,354  
Research and development* [1] 134,608 136,520 398,425 521,334  
Income (loss) from operations (1,692,029) (621,913) (3,880,724) (2,469,688)  
Trade receivables (49,547)   (49,547)   (47,154)
Chromaline [Member] | Operating Segments [Member]          
Net sales 2,954,569 2,051,047 7,306,983 5,635,373  
Cost of goods sold 2,076,840 1,474,881 5,217,363 4,300,512  
Gross profit (loss) 877,729 576,166 2,089,620 1,334,861  
Selling general and administrative* [1] 331,134 234,884 879,064 1,027,239  
Research and development* [1] 0 0 0 0  
Income (loss) from operations 546,595 341,282 1,210,556 307,622  
Trade receivables 1,266,482   1,266,482   1,676,592
Ikonics Imaging [Member] | Operating Segments [Member]          
Net sales 1,445,926 893,064 3,797,382 2,488,963  
Cost of goods sold 759,955 499,750 1,953,681 1,397,458  
Gross profit (loss) 685,971 393,314 1,843,701 1,091,505  
Selling general and administrative* [1] 316,535 180,285 792,290 683,720  
Research and development* [1] 0 0 0 0  
Income (loss) from operations 369,436 213,029 1,051,411 407,785  
Trade receivables 482,691   482,691   396,116
DTX [Member] | Operating Segments [Member]          
Net sales 81,925 62,024 243,680 223,606  
Cost of goods sold 36,762 33,143 113,814 109,235  
Gross profit (loss) 45,163 28,881 129,866 114,371  
Selling general and administrative* [1] 31,811 27,567 93,851 91,999  
Research and development* [1] 0 0 0 0  
Income (loss) from operations 13,352 1,314 36,015 22,372  
Trade receivables 19,908   19,908   35,983
AMS [Member] | Operating Segments [Member]          
Net sales 261,032 128,849 720,163 856,673  
Cost of goods sold 287,805 253,431 775,624 985,504  
Gross profit (loss) (26,773) (124,582) (55,461) (128,831)  
Selling general and administrative* [1] 37,153 51,644 154,643 211,788  
Research and development* [1] 0 0 0 0  
Income (loss) from operations (63,926) $ (176,226) (210,104) $ (340,619)  
Trade receivables $ 155,643   $ 155,643   $ 57,676
[1] The Company does not allocate all selling, general and administrative expenses or any research and development expenses to its operating segments for internal reporting.