Note 8. Short-Term Borrowings (Tables)

12 Months Ended

Dec. 31, 2015

Note 8. Short-Term Borrowings (Tables) [Line Items]

Schedule of Short-term Debt [Table Text Block]

	2015		2014
Overnight repurchase agreements with customers	$	73,872,716	$	137,251,670
Federal funds purchased		70,790,000		131,100,000
	$	144,662,716	$	268,351,670

Schedule of Repurchase Agreements [Table Text Block]

	2015			2014
Average daily balance during the period	$	121,186,231		$	128,818,152
Average daily interest rate during the period		0.11	%		0.12	%
Maximum month-end balance during the period	$	159,407,193		$	147,623,624
Weighted average rate as of end of period		0.11	%		0.11	%

	2015			2014
Average daily balance during the period	$	32,826,489		$	33,876,815
Average daily interest rate during the period		0.41	%		0.40	%
Maximum month-end balance during the period	$	126,220,000		$	131,100,000
Weighted average rate as of end of period		0.57	%		0.51	%

Securities Sold under Agreements to Repurchase [Member]

Note 8. Short-Term Borrowings (Tables) [Line Items]

Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets [Table Text Block]

	2015		2014
U.S. govt. sponsored agency securities	$	29,499,803	$	68,430,410
Residential mortgage-backed and related securities		65,888,911		96,930,017
Total securities pledged to overnight customer repurchase agreements	$	95,388,714	$	165,360,427
Less: overcollateralized position		21,515,998		28,108,757
	$	73,872,716	$	137,251,670