Note 5 - Segment Information - Reportable Segments (Details) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Net sales		$ 4,251,348	$ 2,572,439	$ 7,324,756	$ 6,069,631
Cost of goods sold		2,822,044	2,187,544	4,899,120	4,531,504
Gross profit		1,429,304	384,895	2,425,636	1,538,127
Selling general and administrative*	[1]	1,944,502	1,202,307	3,128,093	2,983,327
Research and development*	[1]	128,895	201,234	263,817	384,814
Income (loss) from operations		(644,093)	(1,018,646)	(966,274)	(1,830,014)
Trade receivables		1,651,035		1,651,035		$ 2,119,213
Segment Reconciling Items [Member]
Net sales		0	0	0	0
Cost of goods sold		0	0	0	0
Gross profit		0	0	0	0
Selling general and administrative*	[1]	1,304,485	524,504	1,924,878	1,462,961
Research and development*	[1]	128,895	201,234	263,817	384,814
Income (loss) from operations		(1,433,380)	(725,738)	(2,188,695)	(1,847,775)
Trade receivables		(37,979)		(37,979)		(47,154)
Chromaline [Member] | Operating Segments [Member]
Net sales		2,653,733	1,619,986	4,352,414	3,584,326
Cost of goods sold		1,905,738	1,407,362	3,140,523	2,825,631
Gross profit		747,995	212,624	1,211,891	758,695
Selling general and administrative*	[1]	289,928	366,136	547,930	792,355
Research and development*	[1]	0	0	0	0
Income (loss) from operations		458,067	(153,512)	663,961	(33,660)
Trade receivables		1,150,630		1,150,630		1,676,592
Ikonics Imaging [Member] | Operating Segments [Member]
Net sales		1,264,855	625,800	2,351,456	1,595,899
Cost of goods sold		644,071	419,985	1,193,726	897,708
Gross profit		620,784	205,815	1,157,730	698,191
Selling general and administrative*	[1]	259,219	224,573	475,755	503,435
Research and development*	[1]	0	0	0	0
Income (loss) from operations		361,565	(18,758)	681,975	194,756
Trade receivables		356,216		356,216		396,116
DTX [Member] | Operating Segments [Member]
Net sales		85,444	49,053	161,755	161,582
Cost of goods sold		34,260	24,346	77,052	76,092
Gross profit		51,184	24,707	84,703	85,490
Selling general and administrative*	[1]	32,001	30,059	62,040	64,432
Research and development*	[1]	0	0	0	0
Income (loss) from operations		19,183	(5,352)	22,663	21,058
Trade receivables		26,759		26,759		35,983
AMS [Member] | Operating Segments [Member]
Net sales		247,316	277,600	459,131	727,824
Cost of goods sold		237,975	335,851	487,819	732,073
Gross profit		9,341	(58,251)	(28,688)	(4,249)
Selling general and administrative*	[1]	58,869	57,035	117,490	160,144
Research and development*	[1]	0	0	0	0
Income (loss) from operations		(49,528)	$ (115,286)	(146,178)	$ (164,393)
Trade receivables		$ 155,409		$ 155,409		$ 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.