Note 2 - Allowance For Loan Losses: Troubled Debt Restructurings on Financing Receivables (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Current 12 months
Financing Receivable, Modifications, Number of Contracts	4,011	3,551	11,487	8,908
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 9,113,525	$ 8,439,442	$ 26,071,283	$ 19,172,566
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 8,751,593	$ 8,107,342	$ 25,017,261	$ 18,300,854
Current 12 months | Cosumer Loans
Financing Receivable, Modifications, Number of Contracts	3,881	3,438	11,117	8,600
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 8,764,876	$ 8,039,469	$ 25,032,298	$ 18,235,460
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 8,419,386	$ 7,717,049	$ 24,018,560	$ 17,404,025
Current 12 months | Real Estate Loans
Financing Receivable, Modifications, Number of Contracts	4	11	18	26
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 27,360	$ 151,271	$ 138,249	$ 308,017
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 27,360	$ 151,271	$ 137,167	$ 308,017
Current 12 months | Sales Finance Contracts
Financing Receivable, Modifications, Number of Contracts	126	102	352	1,282
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 321,289	$ 248,702	$ 900,736	$ 629,089
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 304,847	$ 239,022	$ 861,534	$ 588,812
Previous 12 months
Financing Receivable, Modifications, Number of Contracts	1,513	1,512	3,728	3,368
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 2,245,162	$ 2,163,074	$ 5,432,295	$ 4,816,673
Previous 12 months | Cosumer Loans
Financing Receivable, Modifications, Number of Contracts	1,465	1,481	3,619	3,271
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 2,162,134	$ 2,121,462	$ 5,244,206	$ 4,662,399
Previous 12 months | Real Estate Loans
Financing Receivable, Modifications, Number of Contracts	0	0	0	1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0	$ 0	$ 0	$ 1,358
Previous 12 months | Sales Finance Contracts
Financing Receivable, Modifications, Number of Contracts	48	31	109	96
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 83,028	$ 41,612	$ 188,089	$ 152,916