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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Statement of Cash Flows [Abstract]      
Payments of Dividends $ (791,737) $ 0 $ 0
Cash flows from operating activities:      
Net loss (25,380,115) (23,031,145) (14,843,067)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 2,501,891 993,621 2,138,982
Accretion of premium or discount on marketable debt securities 41,364 130,032 168,217
Stock-based compensation 2,296,131 2,425,326 3,145,479
Net gain on investment transactions (2,000,000) (1,034,396) (9,206,919)
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property 0 0 180,715
Deferred income taxes (2,421,040) 1,451,858 (75,000)
Foreign Currency Transaction Gain (Loss), before Tax 893,260 711,356 (455,614)
Gain (Loss) on Disposition of Property Plant Equipment 0 (7,700,522) 0
Goodwill, Impairment Loss 600,086 0 0
Change in allowance for bad debt 13,000 (17,000) (112,500)
Change in warranty reserves 654,694 677,330 1,560,259
Extended Product Warranty Accrual, Preexisting Increase (Decrease) 142,328 0 (200,000)
Changes in assets and liabilities:      
Accounts receivable (2,376,593) (39,629) 2,850,942
Inventory (1,633,027) (1,527,602) (8,484)
Prepaid expenses and other current assets (1,084,146) 48,295 (207,421)
Accounts payable and accrued expenses 1,924,751 1,163,586 (2,632,385)
Billings in excess of revenue earned (85,282) (425,805) 777,247
Net cash used in operating activities (25,912,698) (26,174,695) (16,919,549)
Cash flows from investing activities:      
Proceeds from sale of marketable debt securities 37,536,004 50,835,253 38,055,759
Purchase of marketable debt securities (19,633,903) (51,828,988) (22,835,740)
Proceeds from Sale and Maturity of Other Investments 0 1,034,396 9,206,919
Business Combination, Consideration Transferred (3,690,047) 0 0
Proceeds from Divestiture of Businesses 0 15,000,000 0
Increase (Decrease) in Assets Held-for-sale 0 8,106,819 0
Other assets (140,860) 80,793 (1,772)
Capital expenditures (2,794,467) (394,897) (1,122,808)
Net cash provided by investing activities 11,276,727 22,833,376 23,302,358
Cash flows from financing activities:      
Proceeds from Sale of Treasury Stock 24,664,250 0 0
Proceeds from exercise of stock options and warrants 0 0 86,047
Settlements of restricted stock for tax withholding obligations (771,323) (510,597) (1,072,385)
Net cash provided by (used in) financing activities 23,101,190 (510,597) (986,338)
Effect of exchange rate changes on cash 560,513 (93,478) (264,383)
Net increase (decrease) in cash and equivalents 9,025,732 (3,945,394) 5,132,088
Cash and equivalents:      
Cash and cash equivalents at beginning of year 15,822,495 19,767,889  
Cash and cash equivalents at end of year 24,848,227 15,822,495 19,767,889
Supplemental schedule of noncash investing activities:      
Income Taxes Paid, Net 281,000 723,000 50,000
Construction in Progress Expenditures Incurred but Not yet Paid $ 212,000 $ 0 $ 0