CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)	Total	Preferred Stock	Common Stock	Additional Paid in Capital	Retained Earnings
Stockholders’ equity, beginning of period at Dec. 28, 2014	$ 16,363,292	$ 0	$ 65,982	$ 10,734,438	$ 5,562,872
Stockholders’ equity (in shares), beginning of period at Dec. 28, 2014			6,598,145
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	352,881			352,881
Issuance of shares, net of offering costs (in shares)			636,500
Issuance of shares, net of offering costs	6,334,610		$ 6,365	6,328,245
Retirement of put options	2,320,145			2,320,145
Exercise of common stock options and warrants (shares)			153,310
Exercise of common stock options and warrants	712,772		$ 1,533	711,239
Cash dividends declared ($0.25 per share)	$ (5,502,684)				(5,502,684)
Common stock, dividends, per share, declared	$ 0.25
Net income	$ 5,347,408				5,347,408
Stockholders’ equity (in shares), end of period at Dec. 27, 2015			7,387,955
Stockholders’ equity, end of period at Dec. 27, 2015	25,928,424	0	$ 73,880	20,446,948	5,407,596
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	313,988			313,988
Issuance of shares, net of offering costs (in shares)			1,191,246
Issuance of shares, net of offering costs	15,108,756		$ 11,912	15,096,844
Exercise of common stock options and warrants (shares)			89,284
Exercise of common stock options and warrants	285,801		$ 893	284,908
Cash dividends declared ($0.25 per share)	$ (8,030,922)				(8,030,922)
Common stock, dividends, per share, declared	$ 0.25
Net income	$ 6,882,407				6,882,407
Stockholders’ equity (in shares), end of period at Dec. 25, 2016			8,668,485
Stockholders’ equity, end of period at Dec. 25, 2016	40,488,454	0	$ 86,685	36,142,688	4,259,081
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	447,301			447,301
Issuance of shares, net of offering costs (in shares)			70,670
Issuance of shares, net of offering costs	992,500		$ 707	991,793
Exercise of common stock options and warrants (shares)			20,221
Exercise of common stock options and warrants	93,749		$ 202	93,547
Cash dividends declared ($0.25 per share)	$ (8,735,759)				(8,735,759)
Common stock, dividends, per share, declared	$ 0.25
Net income	$ 5,848,434				5,848,434
Stockholders’ equity (in shares), end of period at Dec. 31, 2017			8,759,376
Stockholders’ equity, end of period at Dec. 31, 2017	$ 39,134,679	$ 0	$ 87,594	$ 37,675,329	$ 1,371,756