Note 6 - Segment Information - Reportable Segments (Details) - USD ($)		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Net sales		$ 3,497,192	$ 3,528,691
Cost of goods sold		2,343,960	2,519,572
Gross profit		1,153,232	1,009,119
Selling general and administrative*	[1]	1,781,020	1,381,965
Research and development*	[1]	183,580	178,842
Income (loss) from operations		(811,368)	(551,688)
Trade receivables		1,760,166		$ 2,434,718
Segment Reconciling Items [Member]
Net sales
Cost of goods sold
Gross profit
Selling general and administrative*	[1]	938,457	491,756
Research and development*	[1]	183,580	178,842
Income (loss) from operations		(1,122,037)	(670,598)
Trade receivables		(113,178)		(52,421)
Chromaline [Member] | Operating Segments [Member]
Net sales		1,964,340	2,029,341
Cost of goods sold		1,418,269	1,553,610
Gross profit		546,071	475,731
Selling general and administrative*	[1]	426,219	445,003
Research and development*	[1]
Income (loss) from operations		119,852	30,728
Trade receivables		1,114,214		1,916,066
Ikonics Imaging [Member] | Operating Segments [Member]
Net sales		970,099	1,088,806
Cost of goods sold		477,723	585,504
Gross profit		492,376	503,302
Selling general and administrative*	[1]	278,862	322,453
Research and development*	[1]
Income (loss) from operations		213,514	180,849
Trade receivables		282,082		304,791
DTX [Member] | Operating Segments [Member]
Net sales		112,529	92,760
Cost of goods sold		51,746	34,046
Gross profit		60,783	58,714
Selling general and administrative*	[1]	34,373	34,605
Research and development*	[1]
Income (loss) from operations		26,410	24,109
Trade receivables		60,764		13,919
AMS [Member] | Operating Segments [Member]
Net sales		450,224	317,784
Cost of goods sold		396,222	346,412
Gross profit		54,002	(28,628)
Selling general and administrative*	[1]	103,109	88,148
Research and development*	[1]
Income (loss) from operations		(49,107)	$ (116,776)
Trade receivables		$ 416,284		$ 252,363

[1] The Company does not allocate all general and administrative expenses or any research and development expenses to its operating segments for internal reporting.