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Note 5 - Segment Information - Reportable Segments (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Net sales $ 18,213,653 $ 17,243,244
Cost of goods sold 11,959,626 11,512,699
Gross profit 6,254,027 5,730,545
Selling, general, and administrative* [1] 5,350,966 5,506,466
Research and development* [1] 677,242 688,688
Income (loss) from operations 225,819 (464,609)
Trade receivables 2,215,215 2,190,260
Segment Reconciling Items [Member]    
Net sales
Cost of goods sold
Gross profit
Selling, general, and administrative* [1] 2,032,116 1,904,058
Research and development* [1] 677,242 688,688
Income (loss) from operations (2,709,358) (2,592,746)
Trade receivables (43,147) (29,779)
Domestic [Member] | Operating Segments [Member]    
Net sales 7,288,433 6,934,433
Cost of goods sold 4,397,353 4,100,497
Gross profit 2,891,080 2,833,936
Selling, general, and administrative* [1] 1,289,923 1,345,427
Research and development* [1]
Income (loss) from operations 1,601,157 1,488,509
Trade receivables 1,019,689 1,119,228
Export [Member] | Operating Segments [Member]    
Net sales 4,877,718 4,722,950
Cost of goods sold 3,841,712 3,721,800
Gross profit 1,036,006 1,001,150
Selling, general, and administrative* [1] 509,549 645,973
Research and development* [1]
Income (loss) from operations 526,457 355,177
Trade receivables 610,334 558,872
Ikonics Imaging [Member] | Operating Segments [Member]    
Net sales 3,842,089 4,021,970
Cost of goods sold 2,034,254 1,915,390
Gross profit 1,807,835 2,106,580
Selling, general, and administrative* [1] 1,001,147 1,065,957
Research and development* [1]
Income (loss) from operations 806,688 1,040,623
Trade receivables 280,939 238,813
DTX [Member] | Operating Segments [Member]    
Net sales 420,714 817,640
Cost of goods sold 137,039 487,509
Gross profit 283,675 330,131
Selling, general, and administrative* [1] 150,698 168,553
Research and development* [1]
Income (loss) from operations 132,977 161,578
Trade receivables 15,692 64,278
AMS [Member] | Operating Segments [Member]    
Net sales 1,784,699 746,251
Cost of goods sold 1,549,268 1,287,503
Gross profit 235,431 (541,252)
Selling, general, and administrative* [1] 367,533 376,498
Research and development* [1]
Income (loss) from operations (132,102) (917,750)
Trade receivables $ 331,708 $ 238,848
[1] The Company does not allocate all general and administrative expenses or any research and development expenses to its operating segments for internal reporting.