Note 11 - Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2015

Notes Tables

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	20 15					20 14					20 13
				Weighted					Weighted					Weighted
				Average					Average					Average
	Option			Exercise		Option			Exercise		Option			Exercise
	Shares			Price		Shares			Price		Shares			Price
Outstanding at January 1		72,400		$	5.16		84,600		$	5.04		121,600		$	4.53
Granted		-			-		-			-		12,000			6.87
Forfeited or expired		(2,000	)		4.96		-			-		-			-
Exchanged		-			-		-			-		-			-
Exercised		(2,000	)		4.96		(12,200	)		4.32		(49,000	)		4.23
Outstanding at December 31		68,400		$	5.17		72,400		$	5.16		84,600		$	5.04
Exercisable at end of year		68,400		$	5.17		72,400		$	5.16		84,600		$	5.04
Weighted-average fair value of options granted during year		n/a					n/a				$	0.97

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

			Options Outstanding						Options Exercisable
					Weighted		Weighted				Weighted		Weighted
					Average		Average				Average		Average
			Option		Exercise		Maturity		Option		Exercise		Maturity
Exercise Price Range			Shares		Price		(Years)		Shares		Price		(Years)
$4.27	to	$4.41		23,400	$	4.39		5.01		23,400	$	4.39		5.01
$4.80	to	$4.96		12,000		4.80		5.28		12,000		4.80		5.28
$5.30	to	$6.87		33,000		5.86		6.35		33,000		5.86		6.35
				68,400	$	5.17		5.70		68,400	$	5.17		5.70

Schedule of Share-based Compensation, Activity [Table Text Block]

	2015		2014		2013
Weighted average grant-date fair value of stock options granted		n/a		n/a	$	0.97
Total fair value of stock options vested		n/a		n/a	$	11,686
Total intrinsic value of stock options exercised	$	2,953	$	14,816	$	113,790

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	201 5		2014		2013
Volatility		n/a		n/a		19.1	%
Expected option life		n/a		n/a		3
Interest rate (risk free)		n/a		n/a		0.80	%
Dividends		n/a		n/a	None

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	Shares			Grant Fair Value
Balance, January 1, 2014		-			-
Granted		34,601		$	8.96
Forfeited		-			-
Vested		-			-
Balance, December 31, 2014		34,601		$	8.96
Balance, January 1, 2015		34,601		$	8.96
Granted		34,484			8.99
Forfeited		-			-
Vested		(8,652	)		8.96
Balance, December 31, 2015		60,433			8.97

Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]

2016	$	155,009
2017		155,009
2018		87,191
2019		9,688