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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 26, 2020
Dec. 28, 2019
Dec. 29, 2018
Cash flows from operating activities:      
Net loss $ (4,530,925) $ (29,374,222) $ (34,482,492)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 651,083 792,221 1,958,680
Accretion of premium or discount on marketable debt securities 7,762 21,838 15,948
Stock-based compensation 821,122 2,057,400 4,791,054
Net loss (gain) on investment transactions 29,356 3,858,453 (2,849,816)
Income taxes 116,536 105,036 4,185
Foreign currency (gains) losses (289,471) (220,015) (1,096,487)
Loss on sale of property and plant 508,833 51,159
Impairment of assets 2,526,669
Impairment of goodwill 331,344 1,417,470
Change in allowance for bad debt (763,159) 633,131 (155,000)
Write-off of excess inventory 667,019 1,834,300 832,615
Change in warranty reserves (1,172) (62,107) (79,633)
Changes in assets and liabilities:      
Accounts receivable (2,954,703) (3,944,859) 853,163
Contract assets and unbilled receivables (2,600,671) 2,168,581 865,474
Inventory (1,332,139) (792,165) (1,656,196)
Prepaid expenses, other current assets and other assets (160,371) 821,340 113,015
Accounts payable and accrued expenses 5,227,011 (163,084) (1,208,848)
Billings in excess of revenue earned 695,565 397,121 (4,742)
Net cash used in operating activities (4,417,157) (21,026,854) (28,103,782)
Cash flows from investing activities:      
Proceeds from sale of marketable debt securities 12,148,117 7,454,139 26,646,078
Purchase of marketable debt securities (5,697,329)
Equity investments purchase (2,500,000) (1,000,000)
Other assets 193,186 (41,031) (8,373)
Capital expenditures (542,862) (170,186) (1,183,131)
Net cash provided by investing activities 11,798,441 4,742,922 18,757,245
Cash flows from financing activities:      
Sale of treasury stock, net of costs 3,829,462
Sale of registered stock, net of costs 8,038,529
Settlements of restricted stock for tax withholding obligations (139,926) (45,513) (208,015)
Distribution to noncontrolling interest holder (699,105)
Net cash provided by (used in) financing activities 3,689,536 7,993,016 (907,120)
Effect of exchange rate changes on cash 12,802 (6,184) (268,223)
Net increase (decrease) in cash and cash equivalents 11,083,622 (8,297,100) (10,521,880)
Cash and cash equivalents at beginning of year 6,029,247 14,326,347 24,848,227
Cash and cash equivalents at end of year 17,112,869 6,029,247 14,326,347
Supplemental disclosure of cash flow information:      
Income taxes paid 1,374,000
Construction in progress included in accrued expenses $ 257,000