Note 9 - Segment Information - Summary of Segment Information (Details) - USD ($)	3 Months Ended			12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2018	Mar. 31, 2017
Revenues	$ 1,021,042	$ 931,139	$ 1,146,355	$ 3,754,212	$ 5,271,231
Segment operating income (loss)	83,775	76,835	3,741	(66,188)	1,138,561
Total assets				4,552,134	4,520,649
Chemical [Member]
Revenues	432,803	310,757	308,355	1,391,522	1,285,353
Segment operating income (loss)	2,068	21,109	65,446	34,611	216,371
Total assets				1,687,276	1,110,111
Electronics [Member]
Revenues	123,685	343,165	493,592	1,056,384	1,820,490
Segment operating income (loss)	(34,788)	63,195	(140,271)	(303,388)	361,484
Total assets				1,280,908	1,553,484
Engineering [Member]
Revenues	464,554	277,217	344,408	1,306,306	2,165,388
Segment operating income (loss)	$ 116,495	$ (7,469)	$ 78,566	202,589	560,706
Total assets				$ 1,583,950	$ 1,857,054