Note 10 - Segment Financial Information: Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information, Revenue for Reportable Segment	$ 49,399	$ 46,979	$ 143,409	$ 138,628
Profit (Loss)	20,022	18,827	59,507	59,882
Segment Reporting Information, Net Assets	447,612		447,612		$ 442,257
Division I
Segment Reporting Information, Revenue for Reportable Segment	6,778	6,617	20,192	19,362
Profit (Loss)	2,296	2,297	7,103	7,339
Segment Reporting Information, Net Assets	60,869		60,869		57,964
Division II
Segment Reporting Information, Revenue for Reportable Segment	12,122	11,456	35,182	33,737
Profit (Loss)	5,637	5,399	16,907	16,505
Segment Reporting Information, Net Assets	104,730		104,730		106,362
Division III
Segment Reporting Information, Revenue for Reportable Segment	11,051	10,739	31,936	31,945
Profit (Loss)	4,923	4,502	14,479	14,783
Segment Reporting Information, Net Assets	98,188		98,188		98,627
Division IV
Segment Reporting Information, Revenue for Reportable Segment	10,443	9,770	29,858	28,458
Profit (Loss)	4,102	3,753	11,650	11,610
Segment Reporting Information, Net Assets	105,659		105,659		103,094
Division V
Segment Reporting Information, Revenue for Reportable Segment	9,005	8,397	26,241	25,126
Profit (Loss)	3,064	$ 2,876	9,368	$ 9,645
Segment Reporting Information, Net Assets	$ 78,166		$ 78,166		$ 76,210