Stock incentive plan (Tables)

12 Months Ended

Dec. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock Options Roll Forward [Table Text Block]

The following table summarizes options outstanding under the stock incentive plan at the indicated dates:

	Year Ended December 31,
	2016								2015
			Weighted								Weighted
			Average								Average
			Exercise		Fair Value		Intrinsic				Exercise		Fair Value		Intrinsic
	Options		Price		Per Share		Value		Options		Price		Per Share		Value
Options outstanding,
beginning of period		2,929	$	24.47	$	12.71				6,830	$	92.34	$	57.97
Granted		-		-		-				-		-		-
Forfeited		(592)		25.48		12.53				(3,901)		168.79		95.85
Exercised		-		-		-				-		-		-
Options outstanding,
end of period		2,337	$	24.21	$	12.76	$	-		2,929	$	24.47	$	12.71	$	-
Options exercisable,
end of period		2,337								1,730

	Year Ended December 31,
	2014
			Weighted
			Average
			Exercise		Fair Value		Intrinsic
	Options		Price		Per Share		Value
Options outstanding,
beginning of period		6,210	$	99.03	$	64.96
Granted		884		25.28		15.52
Forfeited		(264)		25.28		80.33
Exercised		-		-		-
Options outstanding,
end of period		6,830	$	92.34	$	57.97	$	-
Options exercisable,
end of period		5,318

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

The following table summarizes information about stock options outstanding at December 31, 2016:

	Outstanding						Exercisable
			Weighted
			Average
			Remaining		Weighted				Weighted
			Years of		Average				Average
Range of	Number of		Contractual		Exercise		Number of		Exercise
Exercise Prices	Options		Life		Price		Options		Price
$16.00-$25.76		2,337		6.06	$	24.21		2,337	$	24.21
		2,337		6.06		24.21		2,337		24.21

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

A summary of changes in the Company’s nonvested restricted stock awards for the year follows:

			Weighted-
			Average		Aggregate
			Grant-Date		Intrinsic
	Shares		Fair-Value		Value
December 31, 2015		47,893	$	20.82	$	1,278,733
Granted		10,850		21.88		289,695
Vested		(16,264)		20.85		(434,257)
Forfeited		(3,399)		(21.53)		(90,727)
December 31, 2016		39,080	$	21.04	$	1,043,444