Note 18 - Operations and Industry Segments and Geographic Areas - Information on Industry Segments (Details) - USD ($)	3 Months Ended								12 Months Ended
	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Oct. 03, 2015	Jul. 01, 2015	Mar. 31, 2015	Dec. 29, 2014	Oct. 01, 2016	Oct. 03, 2015	Sep. 27, 2014
Net sales									$ 67,627,170	$ 64,314,996	$ 55,857,375
Operating profit	$ 1,879,000	$ 1,486,000	$ 1,160,000	$ 1,556,000	$ 1,670,000	$ 1,318,000	$ 925,000	$ 1,344,000	6,082,264	5,257,452	3,610,580
Corporate expense									16,198,912	16,378,531	15,179,058
Other income (expense)									(7,933)	407,946	18,187
Income before income taxes									6,074,331	5,665,398	3,628,767
Identifiable assets	33,561,539				32,181,622				33,561,539	32,181,622	35,846,834
Depreciation and Amortization, Operating									1,180,032	1,221,778	1,288,525
Property and equipment, net	4,116,070				4,536,104				4,116,070	4,536,104	4,888,096
Goodwill	3,937,676				3,930,282				3,937,676	3,930,282	4,291,843
Intangibles, net	1,989,899				2,214,762				1,989,899	2,214,762	2,860,260
UNITED STATES
Net sales									60,850,466	56,470,245	49,804,659
Property and equipment, net	3,541,623				3,927,018				3,541,623	3,927,018	4,181,361
Goodwill	1,924,131				1,924,131				1,924,131	1,924,131	1,924,131
Intangibles, net	308,710				309,164				308,710	309,164	303,456
CANADA
Net sales									5,798,244	7,704,410	5,922,543
Property and equipment, net	574,447				609,086				574,447	609,086	706,735
Intangibles, net	1,681,189				1,905,598				1,681,189	1,905,598	2,556,804
Other Areas [Member]
Net sales									978,460	140,341	130,173
Goodwill	2,013,545				2,006,151				2,013,545	2,006,151	2,367,712
Operating Segments [Member]
Net sales									67,627,170	64,314,996	55,857,375
Operating profit									6,841,750	6,107,305	4,224,602
Corporate, Non-Segment [Member]
Corporate expense									(759,486)	(849,853)	(614,022)
Identifiable assets	6,917,614				4,122,862				6,917,614	4,122,862	9,633,841
Depreciation and Amortization, Operating									655	514	409
Capital Expenditures									439,693	654,865	670,845
Medical [Member] | Operating Segments [Member]
Net sales									46,345,525	47,810,988	42,334,896
Operating profit									6,040,202	6,342,253	3,966,605
Identifiable assets	22,299,011				20,886,470				22,299,011	20,886,470	22,221,526
Depreciation and Amortization, Operating									909,972	977,922	1,069,882
Capital Expenditures									322,310	428,206	595,002
Custom Products [Member] | Operating Segments [Member]
Net sales									21,281,645	16,504,008	13,522,479
Operating profit									801,548	(234,948)	257,997
Identifiable assets	$ 4,344,914				$ 7,172,290				4,344,914	7,172,290	3,991,467
Depreciation and Amortization, Operating									269,405	243,342	218,234
Capital Expenditures									$ 117,383	$ 226,659	$ 75,843