NOTE 6: LOANS AND ALLOWANCE FOR LOAN LOSSES: Impaired Financing Receivables (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Loans Receivable
Impaired Financing Receivable, Recorded Investment	$ 8,765	$ 10,495	$ 8,765	$ 10,495	$ 10,267
Impaired Financing Receivable, Unpaid Principal Balance	8,939	11,872	8,939	11,872	11,435
Impaired Financing Receivable, Related Allowance	746	934	746	934	929
Impaired Financing Receivable, Average Recorded Investment	9,512	10,539	10,084	13,196	12,487
Impaired Financing Receivable Interest Income Recognized	140	156	401	611	839
Commercial Loan
Impaired Financing Receivable, Recorded Investment	0	0	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance	0	0	0	0	0
Impaired Financing Receivable, Related Allowance	0	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0	0	0	0
Impaired Financing Receivable Interest Income Recognized	0	0	0	0	0
Commercial Real Estate
Impaired Financing Receivable, Recorded Investment	3,056	4,286	3,056	4,286	4,020
Impaired Financing Receivable, Unpaid Principal Balance	3,056	4,312	3,056	4,312	4,049
Impaired Financing Receivable, Related Allowance	466	569	466	569	517
Impaired Financing Receivable, Average Recorded Investment	3,829	4,427	3,946	5,217	4,940
Impaired Financing Receivable Interest Income Recognized	30	62	97	198	264
Industrial revenue bonds
Impaired Financing Receivable, Recorded Investment	0	0	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance	0	0	0	0	0
Impaired Financing Receivable, Related Allowance	0	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0	0	0	0
Impaired Financing Receivable Interest Income Recognized	0	0	0	0	0
Automobile Loan
Impaired Financing Receivable, Recorded Investment	1,024	840	1,024	840	1,117
Impaired Financing Receivable, Unpaid Principal Balance	1,040	1,083	1,040	1,083	1,334
Impaired Financing Receivable, Related Allowance	166	107	166	107	181
Impaired Financing Receivable, Average Recorded Investment	889	883	945	1,121	1,128
Impaired Financing Receivable Interest Income Recognized	37	21	77	64	125
Home Equity Line of Credit
Impaired Financing Receivable, Recorded Investment	553	541	553	541	528
Impaired Financing Receivable, Unpaid Principal Balance	558	563	558	563	548
Impaired Financing Receivable, Related Allowance	4	4	4	4	4
Impaired Financing Receivable, Average Recorded Investment	528	447	535	318	362
Impaired Financing Receivable Interest Income Recognized	7	13	26	30	37
Land Improvements
Impaired Financing Receivable, Recorded Investment	0	83	0	83	0
Impaired Financing Receivable, Unpaid Principal Balance	0	83	0	83	0
Impaired Financing Receivable, Related Allowance	0	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	83	0	428	328
Impaired Financing Receivable Interest Income Recognized	0	2	0	101	101
One- to four-family residential construction
Impaired Financing Receivable, Recorded Investment	0	0	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance	0	0	0	0	0
Impaired Financing Receivable, Related Allowance	0	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0	0	0	0
Impaired Financing Receivable Interest Income Recognized	0	0	0	0	0
Subdivision construction
Impaired Financing Receivable, Recorded Investment	22	256	22	256	251
Impaired Financing Receivable, Unpaid Principal Balance	22	256	22	256	251
Impaired Financing Receivable, Related Allowance	0	98	0	98	96
Impaired Financing Receivable, Average Recorded Investment	22	269	147	285	277
Impaired Financing Receivable Interest Income Recognized	0	2	3	7	9
Owner occupied one- to four-family residential
Impaired Financing Receivable, Recorded Investment	3,342	2,055	3,342	2,055	2,300
Impaired Financing Receivable, Unpaid Principal Balance	3,460	2,312	3,460	2,312	2,423
Impaired Financing Receivable, Related Allowance	78	105	78	105	82
Impaired Financing Receivable, Average Recorded Investment	3,146	2,042	2,850	2,745	2,598
Impaired Financing Receivable Interest Income Recognized	44	23	124	80	131
Non-owner occupied one- to four-family residential
Impaired Financing Receivable, Recorded Investment	238	795	238	795	409
Impaired Financing Receivable, Unpaid Principal Balance	238	980	238	980	574
Impaired Financing Receivable, Related Allowance	0	21	0	21	20
Impaired Financing Receivable, Average Recorded Investment	267	687	372	1,093	954
Impaired Financing Receivable Interest Income Recognized	0	14	11	32	43
Other residential
Impaired Financing Receivable, Recorded Investment	0	0	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance	0	0	0	0	0
Impaired Financing Receivable, Related Allowance	0	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0	0	0	0
Impaired Financing Receivable Interest Income Recognized	0	0	0	0	0
Commercial Borrower
Impaired Financing Receivable, Recorded Investment	197	1,299	197	1,299	1,286
Impaired Financing Receivable, Unpaid Principal Balance	210	1,766	210	1,766	1,771
Impaired Financing Receivable, Related Allowance	15	14	15	14	13
Impaired Financing Receivable, Average Recorded Investment	538	1,370	1,008	1,590	1,517
Impaired Financing Receivable Interest Income Recognized	5	7	30	65	81
Consumer Borrower
Impaired Financing Receivable, Recorded Investment	333	340	333	340	356
Impaired Financing Receivable, Unpaid Principal Balance	355	517	355	517	485
Impaired Financing Receivable, Related Allowance	17	16	17	16	16
Impaired Financing Receivable, Average Recorded Investment	293	331	281	399	383
Impaired Financing Receivable Interest Income Recognized	$ 17	$ 12	$ 33	$ 34	$ 48