Note 10 - Segment Financial Information: Schedule of Segment Reporting Information, by Segment (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Division I
Segment Reporting Information, Revenue for Reportable Segment	$ 6,171	$ 6,536,000	$ 18,462,000	$ 20,473,000
Profit (Loss)	1,647,000	1,265,000	4,912,000	4,681,000
Segment Reporting Information, Net Assets	58,317,000		58,317,000		$ 56,284,000
Division II
Segment Reporting Information, Revenue for Reportable Segment	11,096,000	11,928,000	34,744,000	35,540,000
Profit (Loss)	3,968,000	4,436,000	11,781,000	14,249,000
Segment Reporting Information, Net Assets	109,336,000		109,336,000		110,568,000
Division III
Segment Reporting Information, Revenue for Reportable Segment	10,975,000	11,332,000	34,128,000	33,367,000
Profit (Loss)	4,116,000	4,155,000	13,348,000	13,514,000
Segment Reporting Information, Net Assets	103,973,000		103,973,000		106,951,000
Division IV
Segment Reporting Information, Revenue for Reportable Segment	8,009,000	7,946,000	23,689,000	24,404,000
Profit (Loss)	2,352,000	2,734,000	7,723,000	9,270,000
Segment Reporting Information, Net Assets	87,450,000		87,450,000		85,140,000
Division V
Segment Reporting Information, Revenue for Reportable Segment	4,467,000	4,678,000	13,400,000	14,254,000
Profit (Loss)	1,177,000	1,197,000	3,691,000	4,166,000
Segment Reporting Information, Net Assets	43,223,000		43,223,000		42,230,000
Division VII
Segment Reporting Information, Revenue for Reportable Segment	3,008,000	2,241,000	8,558,000	6,561,000
Profit (Loss)	22,000	119,000	508,000	729,000
Segment Reporting Information, Net Assets	32,715,000		32,715,000		25,764,000
Division VIII
Segment Reporting Information, Revenue for Reportable Segment	3,453,000	3,679,000	10,208,000	11,628,000
Profit (Loss)	707,000	385,000	1,530,000	1,901,000
Segment Reporting Information, Net Assets	32,786,000		32,786,000		32,302,000
Segment Reporting Information, Revenue for Reportable Segment	47,179,000	48,340,000	143,189,000	146,227,000
Profit (Loss)	13,989,000	$ 14,291,000	43,493,000	$ 48,510,000
Segment Reporting Information, Net Assets	$ 467,800,000		$ 467,800,000		$ 459,239,000